Home / 918,019.70-1,377,029.55-420,355.70

Finding the Fourth Proportional to 918,019.70, 1,377,029.55 and 420,355.70

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Solution

The fourth proportional to 918,019.70, 1,377,029.55 and 420,355.70 is: 630,533.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,019.70 : 1,377,029.55 = 420,355.70 : x
  2. Step 2: Convert to fraction form
    918,019.70/1,377,029.55 = 420,355.70/x
  3. Step 3: Cross multiply
    918,019.70x = 1,377,029.55 × 420,355.70
  4. Step 4: Simplify right side
    918,019.70x = 578,842,220,410.94
  5. Step 5: Solve for x
    x = 578,842,220,410.94/918,019.70
  6. Step 6: Final answer
    x = 630,533.55

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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.