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Finding the Fourth Proportional to 139.76, 192.92 and 93.20

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Solution

The fourth proportional to 139.76, 192.92 and 93.20 is: 128.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.76 : 192.92 = 93.20 : x
  2. Step 2: Convert to fraction form
    139.76/192.92 = 93.20/x
  3. Step 3: Cross multiply
    139.76x = 192.92 × 93.20
  4. Step 4: Simplify right side
    139.76x = 17,980.14
  5. Step 5: Solve for x
    x = 17,980.14/139.76
  6. Step 6: Final answer
    x = 128.65

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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.