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Finding the Fourth Proportional to 709,920.59, 979,730.10 and 387,660.60

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Solution

The fourth proportional to 709,920.59, 979,730.10 and 387,660.60 is: 534,993.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,920.59 : 979,730.10 = 387,660.60 : x
  2. Step 2: Convert to fraction form
    709,920.59/979,730.10 = 387,660.60/x
  3. Step 3: Cross multiply
    709,920.59x = 979,730.10 × 387,660.60
  4. Step 4: Simplify right side
    709,920.59x = 379,802,758,404.06
  5. Step 5: Solve for x
    x = 379,802,758,404.06/709,920.59
  6. Step 6: Final answer
    x = 534,993.30

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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.