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Finding the Fourth Proportional to 111.16, 153.40 and 66.90

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Solution

The fourth proportional to 111.16, 153.40 and 66.90 is: 92.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.16 : 153.40 = 66.90 : x
  2. Step 2: Convert to fraction form
    111.16/153.40 = 66.90/x
  3. Step 3: Cross multiply
    111.16x = 153.40 × 66.90
  4. Step 4: Simplify right side
    111.16x = 10,262.75
  5. Step 5: Solve for x
    x = 10,262.75/111.16
  6. Step 6: Final answer
    x = 92.32

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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.