Home / 918,085.70-1,377,128.55-420,421.70

Finding the Fourth Proportional to 918,085.70, 1,377,128.55 and 420,421.70

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Solution

The fourth proportional to 918,085.70, 1,377,128.55 and 420,421.70 is: 630,632.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,085.70 : 1,377,128.55 = 420,421.70 : x
  2. Step 2: Convert to fraction form
    918,085.70/1,377,128.55 = 420,421.70/x
  3. Step 3: Cross multiply
    918,085.70x = 1,377,128.55 × 420,421.70
  4. Step 4: Simplify right side
    918,085.70x = 578,974,726,109.54
  5. Step 5: Solve for x
    x = 578,974,726,109.54/918,085.70
  6. Step 6: Final answer
    x = 630,632.55

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.