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Finding the Fourth Proportional to 124.34, 171.64 and 87.64

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Solution

The fourth proportional to 124.34, 171.64 and 87.64 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.34 : 171.64 = 87.64 : x
  2. Step 2: Convert to fraction form
    124.34/171.64 = 87.64/x
  3. Step 3: Cross multiply
    124.34x = 171.64 × 87.64
  4. Step 4: Simplify right side
    124.34x = 15,042.53
  5. Step 5: Solve for x
    x = 15,042.53/124.34
  6. Step 6: Final answer
    x = 120.98

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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.