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Finding the Fourth Proportional to 429,393.43, 644,191.30 and 129,876.49

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Solution

The fourth proportional to 429,393.43, 644,191.30 and 129,876.49 is: 194,845.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,393.43 : 644,191.30 = 129,876.49 : x
  2. Step 2: Convert to fraction form
    429,393.43/644,191.30 = 129,876.49/x
  3. Step 3: Cross multiply
    429,393.43x = 644,191.30 × 129,876.49
  4. Step 4: Simplify right side
    429,393.43x = 83,665,301,711.58
  5. Step 5: Solve for x
    x = 83,665,301,711.58/429,393.43
  6. Step 6: Final answer
    x = 194,845.33

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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.