Home / 918,009.20-1,377,013.80-420,345.20

Finding the Fourth Proportional to 918,009.20, 1,377,013.80 and 420,345.20

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Solution

The fourth proportional to 918,009.20, 1,377,013.80 and 420,345.20 is: 630,517.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,009.20 : 1,377,013.80 = 420,345.20 : x
  2. Step 2: Convert to fraction form
    918,009.20/1,377,013.80 = 420,345.20/x
  3. Step 3: Cross multiply
    918,009.20x = 1,377,013.80 × 420,345.20
  4. Step 4: Simplify right side
    918,009.20x = 578,821,141,163.76
  5. Step 5: Solve for x
    x = 578,821,141,163.76/918,009.20
  6. Step 6: Final answer
    x = 630,517.80

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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.