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Finding the Fourth Proportional to 659,872.40, 991,882.20 and 647,430.80

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Solution

The fourth proportional to 659,872.40, 991,882.20 and 647,430.80 is: 973,180.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,872.40 : 991,882.20 = 647,430.80 : x
  2. Step 2: Convert to fraction form
    659,872.40/991,882.20 = 647,430.80/x
  3. Step 3: Cross multiply
    659,872.40x = 991,882.20 × 647,430.80
  4. Step 4: Simplify right side
    659,872.40x = 642,175,086,251.76
  5. Step 5: Solve for x
    x = 642,175,086,251.76/659,872.40
  6. Step 6: Final answer
    x = 973,180.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.