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Finding the Fourth Proportional to 124.86, 187.20 and 79.14

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Solution

The fourth proportional to 124.86, 187.20 and 79.14 is: 118.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.86 : 187.20 = 79.14 : x
  2. Step 2: Convert to fraction form
    124.86/187.20 = 79.14/x
  3. Step 3: Cross multiply
    124.86x = 187.20 × 79.14
  4. Step 4: Simplify right side
    124.86x = 14,815.01
  5. Step 5: Solve for x
    x = 14,815.01/124.86
  6. Step 6: Final answer
    x = 118.65

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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.