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Finding the Fourth Proportional to 86.02, 129.10 and 37.92

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Solution

The fourth proportional to 86.02, 129.10 and 37.92 is: 56.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.02 : 129.10 = 37.92 : x
  2. Step 2: Convert to fraction form
    86.02/129.10 = 37.92/x
  3. Step 3: Cross multiply
    86.02x = 129.10 × 37.92
  4. Step 4: Simplify right side
    86.02x = 4,895.47
  5. Step 5: Solve for x
    x = 4,895.47/86.02
  6. Step 6: Final answer
    x = 56.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.