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Finding the Fourth Proportional to 111.40, 152.97 and 89.40

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Solution

The fourth proportional to 111.40, 152.97 and 89.40 is: 122.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.40 : 152.97 = 89.40 : x
  2. Step 2: Convert to fraction form
    111.40/152.97 = 89.40/x
  3. Step 3: Cross multiply
    111.40x = 152.97 × 89.40
  4. Step 4: Simplify right side
    111.40x = 13,675.52
  5. Step 5: Solve for x
    x = 13,675.52/111.40
  6. Step 6: Final answer
    x = 122.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.