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Finding the Fourth Proportional to 129,605.90, 193,969.91 and 79,717.59

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Solution

The fourth proportional to 129,605.90, 193,969.91 and 79,717.59 is: 119,306.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,605.90 : 193,969.91 = 79,717.59 : x
  2. Step 2: Convert to fraction form
    129,605.90/193,969.91 = 79,717.59/x
  3. Step 3: Cross multiply
    129,605.90x = 193,969.91 × 79,717.59
  4. Step 4: Simplify right side
    129,605.90x = 15,462,813,359.13
  5. Step 5: Solve for x
    x = 15,462,813,359.13/129,605.90
  6. Step 6: Final answer
    x = 119,306.40

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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.