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Finding the Fourth Proportional to 139.95, 192.36 and 123.48

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Solution

The fourth proportional to 139.95, 192.36 and 123.48 is: 169.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.95 : 192.36 = 123.48 : x
  2. Step 2: Convert to fraction form
    139.95/192.36 = 123.48/x
  3. Step 3: Cross multiply
    139.95x = 192.36 × 123.48
  4. Step 4: Simplify right side
    139.95x = 23,752.61
  5. Step 5: Solve for x
    x = 23,752.61/139.95
  6. Step 6: Final answer
    x = 169.72

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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.