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Finding the Fourth Proportional to 111.37, 153.60 and 85.15

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Solution

The fourth proportional to 111.37, 153.60 and 85.15 is: 117.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.37 : 153.60 = 85.15 : x
  2. Step 2: Convert to fraction form
    111.37/153.60 = 85.15/x
  3. Step 3: Cross multiply
    111.37x = 153.60 × 85.15
  4. Step 4: Simplify right side
    111.37x = 13,079.04
  5. Step 5: Solve for x
    x = 13,079.04/111.37
  6. Step 6: Final answer
    x = 117.44

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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.