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Finding the Fourth Proportional to 106.78, 147.36 and 101.92

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Solution

The fourth proportional to 106.78, 147.36 and 101.92 is: 140.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.78 : 147.36 = 101.92 : x
  2. Step 2: Convert to fraction form
    106.78/147.36 = 101.92/x
  3. Step 3: Cross multiply
    106.78x = 147.36 × 101.92
  4. Step 4: Simplify right side
    106.78x = 15,018.93
  5. Step 5: Solve for x
    x = 15,018.93/106.78
  6. Step 6: Final answer
    x = 140.65

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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.