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Finding the Fourth Proportional to 709,411.80, 979,009.10 and 387,142.71

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Solution

The fourth proportional to 709,411.80, 979,009.10 and 387,142.71 is: 534,268.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,411.80 : 979,009.10 = 387,142.71 : x
  2. Step 2: Convert to fraction form
    709,411.80/979,009.10 = 387,142.71/x
  3. Step 3: Cross multiply
    709,411.80x = 979,009.10 × 387,142.71
  4. Step 4: Simplify right side
    709,411.80x = 379,016,234,152.95
  5. Step 5: Solve for x
    x = 379,016,234,152.95/709,411.80
  6. Step 6: Final answer
    x = 534,268.30

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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.