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Finding the Fourth Proportional to 116.68, 174.50 and 87.42

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Solution

The fourth proportional to 116.68, 174.50 and 87.42 is: 130.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.68 : 174.50 = 87.42 : x
  2. Step 2: Convert to fraction form
    116.68/174.50 = 87.42/x
  3. Step 3: Cross multiply
    116.68x = 174.50 × 87.42
  4. Step 4: Simplify right side
    116.68x = 15,254.35
  5. Step 5: Solve for x
    x = 15,254.35/116.68
  6. Step 6: Final answer
    x = 130.74

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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.