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Finding the Fourth Proportional to 680,454.72, 939,064.32 and 378,655.20

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Solution

The fourth proportional to 680,454.72, 939,064.32 and 378,655.20 is: 522,564.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,454.72 : 939,064.32 = 378,655.20 : x
  2. Step 2: Convert to fraction form
    680,454.72/939,064.32 = 378,655.20/x
  3. Step 3: Cross multiply
    680,454.72x = 939,064.32 × 378,655.20
  4. Step 4: Simplify right side
    680,454.72x = 355,581,587,902.46
  5. Step 5: Solve for x
    x = 355,581,587,902.46/680,454.72
  6. Step 6: Final answer
    x = 522,564.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.