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Finding the Fourth Proportional to 86.97, 130.40 and 61.35

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Solution

The fourth proportional to 86.97, 130.40 and 61.35 is: 91.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.97 : 130.40 = 61.35 : x
  2. Step 2: Convert to fraction form
    86.97/130.40 = 61.35/x
  3. Step 3: Cross multiply
    86.97x = 130.40 × 61.35
  4. Step 4: Simplify right side
    86.97x = 8,000.04
  5. Step 5: Solve for x
    x = 8,000.04/86.97
  6. Step 6: Final answer
    x = 91.99

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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.