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Finding the Fourth Proportional to 136.51, 187.31 and 124.20

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Solution

The fourth proportional to 136.51, 187.31 and 124.20 is: 170.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.51 : 187.31 = 124.20 : x
  2. Step 2: Convert to fraction form
    136.51/187.31 = 124.20/x
  3. Step 3: Cross multiply
    136.51x = 187.31 × 124.20
  4. Step 4: Simplify right side
    136.51x = 23,264.21
  5. Step 5: Solve for x
    x = 23,264.21/136.51
  6. Step 6: Final answer
    x = 170.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.