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Finding the Fourth Proportional to 106.38, 147.56 and 103.28

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Solution

The fourth proportional to 106.38, 147.56 and 103.28 is: 143.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.38 : 147.56 = 103.28 : x
  2. Step 2: Convert to fraction form
    106.38/147.56 = 103.28/x
  3. Step 3: Cross multiply
    106.38x = 147.56 × 103.28
  4. Step 4: Simplify right side
    106.38x = 15,238.74
  5. Step 5: Solve for x
    x = 15,238.74/106.38
  6. Step 6: Final answer
    x = 143.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.