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Finding the Fourth Proportional to 139.50, 192.51 and 81.32

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Solution

The fourth proportional to 139.50, 192.51 and 81.32 is: 112.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 192.51 = 81.32 : x
  2. Step 2: Convert to fraction form
    139.50/192.51 = 81.32/x
  3. Step 3: Cross multiply
    139.50x = 192.51 × 81.32
  4. Step 4: Simplify right side
    139.50x = 15,653.95
  5. Step 5: Solve for x
    x = 15,653.95/139.50
  6. Step 6: Final answer
    x = 112.21

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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.