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Finding the Fourth Proportional to 111.20, 153.56 and 89.53

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Solution

The fourth proportional to 111.20, 153.56 and 89.53 is: 123.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.20 : 153.56 = 89.53 : x
  2. Step 2: Convert to fraction form
    111.20/153.56 = 89.53/x
  3. Step 3: Cross multiply
    111.20x = 153.56 × 89.53
  4. Step 4: Simplify right side
    111.20x = 13,748.23
  5. Step 5: Solve for x
    x = 13,748.23/111.20
  6. Step 6: Final answer
    x = 123.64

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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.