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Finding the Fourth Proportional to 139.29, 207.85 and 123.95

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Solution

The fourth proportional to 139.29, 207.85 and 123.95 is: 184.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.29 : 207.85 = 123.95 : x
  2. Step 2: Convert to fraction form
    139.29/207.85 = 123.95/x
  3. Step 3: Cross multiply
    139.29x = 207.85 × 123.95
  4. Step 4: Simplify right side
    139.29x = 25,762.28
  5. Step 5: Solve for x
    x = 25,762.28/139.29
  6. Step 6: Final answer
    x = 184.96

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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.