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Finding the Fourth Proportional to 124.90, 187.28 and 43.72

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Solution

The fourth proportional to 124.90, 187.28 and 43.72 is: 65.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.90 : 187.28 = 43.72 : x
  2. Step 2: Convert to fraction form
    124.90/187.28 = 43.72/x
  3. Step 3: Cross multiply
    124.90x = 187.28 × 43.72
  4. Step 4: Simplify right side
    124.90x = 8,186.95
  5. Step 5: Solve for x
    x = 8,186.95/124.90
  6. Step 6: Final answer
    x = 65.55

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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.