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Finding the Fourth Proportional to 139.79, 192.92 and 87.35

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Solution

The fourth proportional to 139.79, 192.92 and 87.35 is: 120.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.79 : 192.92 = 87.35 : x
  2. Step 2: Convert to fraction form
    139.79/192.92 = 87.35/x
  3. Step 3: Cross multiply
    139.79x = 192.92 × 87.35
  4. Step 4: Simplify right side
    139.79x = 16,850.16
  5. Step 5: Solve for x
    x = 16,850.16/139.79
  6. Step 6: Final answer
    x = 120.54

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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.