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Finding the Fourth Proportional to 111.17, 153.38 and 66.90

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Solution

The fourth proportional to 111.17, 153.38 and 66.90 is: 92.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.17 : 153.38 = 66.90 : x
  2. Step 2: Convert to fraction form
    111.17/153.38 = 66.90/x
  3. Step 3: Cross multiply
    111.17x = 153.38 × 66.90
  4. Step 4: Simplify right side
    111.17x = 10,261.86
  5. Step 5: Solve for x
    x = 10,261.86/111.17
  6. Step 6: Final answer
    x = 92.31

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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.