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Finding the Fourth Proportional to 129,591.57, 178,814.67 and 72,218.30

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Solution

The fourth proportional to 129,591.57, 178,814.67 and 72,218.30 is: 99,649.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,591.57 : 178,814.67 = 72,218.30 : x
  2. Step 2: Convert to fraction form
    129,591.57/178,814.67 = 72,218.30/x
  3. Step 3: Cross multiply
    129,591.57x = 178,814.67 × 72,218.30
  4. Step 4: Simplify right side
    129,591.57x = 12,913,691,482.46
  5. Step 5: Solve for x
    x = 12,913,691,482.46/129,591.57
  6. Step 6: Final answer
    x = 99,649.16

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.