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Finding the Fourth Proportional to 109.90, 151.68 and 66.28

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Solution

The fourth proportional to 109.90, 151.68 and 66.28 is: 91.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.90 : 151.68 = 66.28 : x
  2. Step 2: Convert to fraction form
    109.90/151.68 = 66.28/x
  3. Step 3: Cross multiply
    109.90x = 151.68 × 66.28
  4. Step 4: Simplify right side
    109.90x = 10,053.35
  5. Step 5: Solve for x
    x = 10,053.35/109.90
  6. Step 6: Final answer
    x = 91.48

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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.