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Finding the Fourth Proportional to 139.48, 207.89 and 136.24

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Solution

The fourth proportional to 139.48, 207.89 and 136.24 is: 203.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.48 : 207.89 = 136.24 : x
  2. Step 2: Convert to fraction form
    139.48/207.89 = 136.24/x
  3. Step 3: Cross multiply
    139.48x = 207.89 × 136.24
  4. Step 4: Simplify right side
    139.48x = 28,322.93
  5. Step 5: Solve for x
    x = 28,322.93/139.48
  6. Step 6: Final answer
    x = 203.06

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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.