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Finding the Fourth Proportional to 129,776.79, 179,079.53 and 78,817.41

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Solution

The fourth proportional to 129,776.79, 179,079.53 and 78,817.41 is: 108,760.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,776.79 : 179,079.53 = 78,817.41 : x
  2. Step 2: Convert to fraction form
    129,776.79/179,079.53 = 78,817.41/x
  3. Step 3: Cross multiply
    129,776.79x = 179,079.53 × 78,817.41
  4. Step 4: Simplify right side
    129,776.79x = 14,114,584,344.53
  5. Step 5: Solve for x
    x = 14,114,584,344.53/129,776.79
  6. Step 6: Final answer
    x = 108,760.47

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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.