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Finding the Fourth Proportional to 106.28, 146.61 and 64.80

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Solution

The fourth proportional to 106.28, 146.61 and 64.80 is: 89.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.28 : 146.61 = 64.80 : x
  2. Step 2: Convert to fraction form
    106.28/146.61 = 64.80/x
  3. Step 3: Cross multiply
    106.28x = 146.61 × 64.80
  4. Step 4: Simplify right side
    106.28x = 9,500.33
  5. Step 5: Solve for x
    x = 9,500.33/106.28
  6. Step 6: Final answer
    x = 89.39

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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.