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Finding the Fourth Proportional to 714,229.80, 985,649.21 and 391,969.90

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Solution

The fourth proportional to 714,229.80, 985,649.21 and 391,969.90 is: 540,925.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,229.80 : 985,649.21 = 391,969.90 : x
  2. Step 2: Convert to fraction form
    714,229.80/985,649.21 = 391,969.90/x
  3. Step 3: Cross multiply
    714,229.80x = 985,649.21 × 391,969.90
  4. Step 4: Simplify right side
    714,229.80x = 386,344,822,278.78
  5. Step 5: Solve for x
    x = 386,344,822,278.78/714,229.80
  6. Step 6: Final answer
    x = 540,925.09

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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.