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Finding the Fourth Proportional to 129,489.63, 178,699.33 and 72,901

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Solution

The fourth proportional to 129,489.63, 178,699.33 and 72,901 is: 100,605.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,489.63 : 178,699.33 = 72,901 : x
  2. Step 2: Convert to fraction form
    129,489.63/178,699.33 = 72,901/x
  3. Step 3: Cross multiply
    129,489.63x = 178,699.33 × 72,901
  4. Step 4: Simplify right side
    129,489.63x = 13,027,359,856.33
  5. Step 5: Solve for x
    x = 13,027,359,856.33/129,489.63
  6. Step 6: Final answer
    x = 100,605.43

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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.