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Finding the Fourth Proportional to 111.39, 153.63 and 88.05

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Solution

The fourth proportional to 111.39, 153.63 and 88.05 is: 121.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.39 : 153.63 = 88.05 : x
  2. Step 2: Convert to fraction form
    111.39/153.63 = 88.05/x
  3. Step 3: Cross multiply
    111.39x = 153.63 × 88.05
  4. Step 4: Simplify right side
    111.39x = 13,527.12
  5. Step 5: Solve for x
    x = 13,527.12/111.39
  6. Step 6: Final answer
    x = 121.44

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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.