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Finding the Fourth Proportional to 709,920.10, 979,729.42 and 387,660.10

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Solution

The fourth proportional to 709,920.10, 979,729.42 and 387,660.10 is: 534,992.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,920.10 : 979,729.42 = 387,660.10 : x
  2. Step 2: Convert to fraction form
    709,920.10/979,729.42 = 387,660.10/x
  3. Step 3: Cross multiply
    709,920.10x = 979,729.42 × 387,660.10
  4. Step 4: Simplify right side
    709,920.10x = 379,802,004,930.14
  5. Step 5: Solve for x
    x = 379,802,004,930.14/709,920.10
  6. Step 6: Final answer
    x = 534,992.61

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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.