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Finding the Fourth Proportional to 116.61, 174.87 and 86.40

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Solution

The fourth proportional to 116.61, 174.87 and 86.40 is: 129.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.61 : 174.87 = 86.40 : x
  2. Step 2: Convert to fraction form
    116.61/174.87 = 86.40/x
  3. Step 3: Cross multiply
    116.61x = 174.87 × 86.40
  4. Step 4: Simplify right side
    116.61x = 15,108.77
  5. Step 5: Solve for x
    x = 15,108.77/116.61
  6. Step 6: Final answer
    x = 129.57

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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.