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Finding the Fourth Proportional to 139.45, 192.42 and 87.02

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Solution

The fourth proportional to 139.45, 192.42 and 87.02 is: 120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.45 : 192.42 = 87.02 : x
  2. Step 2: Convert to fraction form
    139.45/192.42 = 87.02/x
  3. Step 3: Cross multiply
    139.45x = 192.42 × 87.02
  4. Step 4: Simplify right side
    139.45x = 16,744.87
  5. Step 5: Solve for x
    x = 16,744.87/139.45
  6. Step 6: Final answer
    x = 120.08

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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.