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Finding the Fourth Proportional to 106.81, 147.47 and 75.38

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Solution

The fourth proportional to 106.81, 147.47 and 75.38 is: 104.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.81 : 147.47 = 75.38 : x
  2. Step 2: Convert to fraction form
    106.81/147.47 = 75.38/x
  3. Step 3: Cross multiply
    106.81x = 147.47 × 75.38
  4. Step 4: Simplify right side
    106.81x = 11,115.17
  5. Step 5: Solve for x
    x = 11,115.17/106.81
  6. Step 6: Final answer
    x = 104.07

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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.