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Finding the Fourth Proportional to 709,469.97, 979,089.30 and 387,200.76

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Solution

The fourth proportional to 709,469.97, 979,089.30 and 387,200.76 is: 534,348.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,469.97 : 979,089.30 = 387,200.76 : x
  2. Step 2: Convert to fraction form
    709,469.97/979,089.30 = 387,200.76/x
  3. Step 3: Cross multiply
    709,469.97x = 979,089.30 × 387,200.76
  4. Step 4: Simplify right side
    709,469.97x = 379,104,121,067.87
  5. Step 5: Solve for x
    x = 379,104,121,067.87/709,469.97
  6. Step 6: Final answer
    x = 534,348.37

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Double scale
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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.