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Finding the Fourth Proportional to 287,592.60, 431,384.85 and 129,820.80

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Solution

The fourth proportional to 287,592.60, 431,384.85 and 129,820.80 is: 194,729.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,592.60 : 431,384.85 = 129,820.80 : x
  2. Step 2: Convert to fraction form
    287,592.60/431,384.85 = 129,820.80/x
  3. Step 3: Cross multiply
    287,592.60x = 431,384.85 × 129,820.80
  4. Step 4: Simplify right side
    287,592.60x = 56,002,726,334.88
  5. Step 5: Solve for x
    x = 56,002,726,334.88/287,592.60
  6. Step 6: Final answer
    x = 194,729.37

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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.