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Finding the Fourth Proportional to 106.10, 146.42 and 61.87

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Solution

The fourth proportional to 106.10, 146.42 and 61.87 is: 85.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.10 : 146.42 = 61.87 : x
  2. Step 2: Convert to fraction form
    106.10/146.42 = 61.87/x
  3. Step 3: Cross multiply
    106.10x = 146.42 × 61.87
  4. Step 4: Simplify right side
    106.10x = 9,059.41
  5. Step 5: Solve for x
    x = 9,059.41/106.10
  6. Step 6: Final answer
    x = 85.38

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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.