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Finding the Fourth Proportional to 129,095.59, 178,168.64 and 72,506.97

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Solution

The fourth proportional to 129,095.59, 178,168.64 and 72,506.97 is: 100,069.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,095.59 : 178,168.64 = 72,506.97 : x
  2. Step 2: Convert to fraction form
    129,095.59/178,168.64 = 72,506.97/x
  3. Step 3: Cross multiply
    129,095.59x = 178,168.64 × 72,506.97
  4. Step 4: Simplify right side
    129,095.59x = 12,918,468,235.42
  5. Step 5: Solve for x
    x = 12,918,468,235.42/129,095.59
  6. Step 6: Final answer
    x = 100,069.01

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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.