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Finding the Fourth Proportional to 137.90, 205.71 and 124.13

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Solution

The fourth proportional to 137.90, 205.71 and 124.13 is: 185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.90 : 205.71 = 124.13 : x
  2. Step 2: Convert to fraction form
    137.90/205.71 = 124.13/x
  3. Step 3: Cross multiply
    137.90x = 205.71 × 124.13
  4. Step 4: Simplify right side
    137.90x = 25,534.78
  5. Step 5: Solve for x
    x = 25,534.78/137.90
  6. Step 6: Final answer
    x = 185.17

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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.