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Finding the Fourth Proportional to 111.65, 153.90 and 85.32

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Solution

The fourth proportional to 111.65, 153.90 and 85.32 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.65 : 153.90 = 85.32 : x
  2. Step 2: Convert to fraction form
    111.65/153.90 = 85.32/x
  3. Step 3: Cross multiply
    111.65x = 153.90 × 85.32
  4. Step 4: Simplify right side
    111.65x = 13,130.75
  5. Step 5: Solve for x
    x = 13,130.75/111.65
  6. Step 6: Final answer
    x = 117.61

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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.