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Finding the Fourth Proportional to 124.64, 185.91 and 120.79

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Solution

The fourth proportional to 124.64, 185.91 and 120.79 is: 180.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.64 : 185.91 = 120.79 : x
  2. Step 2: Convert to fraction form
    124.64/185.91 = 120.79/x
  3. Step 3: Cross multiply
    124.64x = 185.91 × 120.79
  4. Step 4: Simplify right side
    124.64x = 22,456.07
  5. Step 5: Solve for x
    x = 22,456.07/124.64
  6. Step 6: Final answer
    x = 180.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.