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Finding the Fourth Proportional to 124.32, 186.46 and 78.61

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Solution

The fourth proportional to 124.32, 186.46 and 78.61 is: 117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.32 : 186.46 = 78.61 : x
  2. Step 2: Convert to fraction form
    124.32/186.46 = 78.61/x
  3. Step 3: Cross multiply
    124.32x = 186.46 × 78.61
  4. Step 4: Simplify right side
    124.32x = 14,656.96
  5. Step 5: Solve for x
    x = 14,656.96/124.32
  6. Step 6: Final answer
    x = 117.89

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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.