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Finding the Fourth Proportional to 680,207.38, 938,687.07 and 378,401.38

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Solution

The fourth proportional to 680,207.38, 938,687.07 and 378,401.38 is: 522,194.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,207.38 : 938,687.07 = 378,401.38 : x
  2. Step 2: Convert to fraction form
    680,207.38/938,687.07 = 378,401.38/x
  3. Step 3: Cross multiply
    680,207.38x = 938,687.07 × 378,401.38
  4. Step 4: Simplify right side
    680,207.38x = 355,200,482,676.16
  5. Step 5: Solve for x
    x = 355,200,482,676.16/680,207.38
  6. Step 6: Final answer
    x = 522,194.40

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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.