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Finding the Fourth Proportional to 129,791.69, 179,112.17 and 72,430.41

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Solution

The fourth proportional to 129,791.69, 179,112.17 and 72,430.41 is: 99,953.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,791.69 : 179,112.17 = 72,430.41 : x
  2. Step 2: Convert to fraction form
    129,791.69/179,112.17 = 72,430.41/x
  3. Step 3: Cross multiply
    129,791.69x = 179,112.17 × 72,430.41
  4. Step 4: Simplify right side
    129,791.69x = 12,973,167,909.09
  5. Step 5: Solve for x
    x = 12,973,167,909.09/129,791.69
  6. Step 6: Final answer
    x = 99,953.77

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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.