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Finding the Fourth Proportional to 109.31, 150.81 and 65.66

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Solution

The fourth proportional to 109.31, 150.81 and 65.66 is: 90.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.31 : 150.81 = 65.66 : x
  2. Step 2: Convert to fraction form
    109.31/150.81 = 65.66/x
  3. Step 3: Cross multiply
    109.31x = 150.81 × 65.66
  4. Step 4: Simplify right side
    109.31x = 9,902.18
  5. Step 5: Solve for x
    x = 9,902.18/109.31
  6. Step 6: Final answer
    x = 90.59

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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.