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Finding the Fourth Proportional to 111.52, 152.80 and 111.20

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Solution

The fourth proportional to 111.52, 152.80 and 111.20 is: 152.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.52 : 152.80 = 111.20 : x
  2. Step 2: Convert to fraction form
    111.52/152.80 = 111.20/x
  3. Step 3: Cross multiply
    111.52x = 152.80 × 111.20
  4. Step 4: Simplify right side
    111.52x = 16,991.36
  5. Step 5: Solve for x
    x = 16,991.36/111.52
  6. Step 6: Final answer
    x = 152.36

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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.