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Finding the Fourth Proportional to 124.58, 187.92 and 121.70

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Solution

The fourth proportional to 124.58, 187.92 and 121.70 is: 183.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.58 : 187.92 = 121.70 : x
  2. Step 2: Convert to fraction form
    124.58/187.92 = 121.70/x
  3. Step 3: Cross multiply
    124.58x = 187.92 × 121.70
  4. Step 4: Simplify right side
    124.58x = 22,869.86
  5. Step 5: Solve for x
    x = 22,869.86/124.58
  6. Step 6: Final answer
    x = 183.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.