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Finding the Fourth Proportional to 139.93, 193.49 and 124.54

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Solution

The fourth proportional to 139.93, 193.49 and 124.54 is: 172.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.93 : 193.49 = 124.54 : x
  2. Step 2: Convert to fraction form
    139.93/193.49 = 124.54/x
  3. Step 3: Cross multiply
    139.93x = 193.49 × 124.54
  4. Step 4: Simplify right side
    139.93x = 24,096.61
  5. Step 5: Solve for x
    x = 24,096.61/139.93
  6. Step 6: Final answer
    x = 172.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.