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Finding the Fourth Proportional to 124.93, 187.21 and 85.85

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Solution

The fourth proportional to 124.93, 187.21 and 85.85 is: 128.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.93 : 187.21 = 85.85 : x
  2. Step 2: Convert to fraction form
    124.93/187.21 = 85.85/x
  3. Step 3: Cross multiply
    124.93x = 187.21 × 85.85
  4. Step 4: Simplify right side
    124.93x = 16,071.98
  5. Step 5: Solve for x
    x = 16,071.98/124.93
  6. Step 6: Final answer
    x = 128.65

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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.