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Finding the Fourth Proportional to 129,467.88, 178,720.90 and 87,051

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Solution

The fourth proportional to 129,467.88, 178,720.90 and 87,051 is: 120,167.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,467.88 : 178,720.90 = 87,051 : x
  2. Step 2: Convert to fraction form
    129,467.88/178,720.90 = 87,051/x
  3. Step 3: Cross multiply
    129,467.88x = 178,720.90 × 87,051
  4. Step 4: Simplify right side
    129,467.88x = 15,557,833,065.90
  5. Step 5: Solve for x
    x = 15,557,833,065.90/129,467.88
  6. Step 6: Final answer
    x = 120,167.51

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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.