Home / 918,138.30-1,377,207.45-287,115.90

Finding the Fourth Proportional to 918,138.30, 1,377,207.45 and 287,115.90

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Solution

The fourth proportional to 918,138.30, 1,377,207.45 and 287,115.90 is: 430,673.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,138.30 : 1,377,207.45 = 287,115.90 : x
  2. Step 2: Convert to fraction form
    918,138.30/1,377,207.45 = 287,115.90/x
  3. Step 3: Cross multiply
    918,138.30x = 1,377,207.45 × 287,115.90
  4. Step 4: Simplify right side
    918,138.30x = 395,418,156,493.46
  5. Step 5: Solve for x
    x = 395,418,156,493.46/918,138.30
  6. Step 6: Final answer
    x = 430,673.85

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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.