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Finding the Fourth Proportional to 111.40, 153.73 and 61.61

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Solution

The fourth proportional to 111.40, 153.73 and 61.61 is: 85.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.40 : 153.73 = 61.61 : x
  2. Step 2: Convert to fraction form
    111.40/153.73 = 61.61/x
  3. Step 3: Cross multiply
    111.40x = 153.73 × 61.61
  4. Step 4: Simplify right side
    111.40x = 9,470.87
  5. Step 5: Solve for x
    x = 9,470.87/111.40
  6. Step 6: Final answer
    x = 85.02

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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.