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Finding the Fourth Proportional to 132,129.92, 182,490.78 and 87,009.68

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Solution

The fourth proportional to 132,129.92, 182,490.78 and 87,009.68 is: 120,173.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,129.92 : 182,490.78 = 87,009.68 : x
  2. Step 2: Convert to fraction form
    132,129.92/182,490.78 = 87,009.68/x
  3. Step 3: Cross multiply
    132,129.92x = 182,490.78 × 87,009.68
  4. Step 4: Simplify right side
    132,129.92x = 15,878,464,370.75
  5. Step 5: Solve for x
    x = 15,878,464,370.75/132,129.92
  6. Step 6: Final answer
    x = 120,173.12

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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.