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Finding the Fourth Proportional to 85.38, 127.58 and 74.04

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Solution

The fourth proportional to 85.38, 127.58 and 74.04 is: 110.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.38 : 127.58 = 74.04 : x
  2. Step 2: Convert to fraction form
    85.38/127.58 = 74.04/x
  3. Step 3: Cross multiply
    85.38x = 127.58 × 74.04
  4. Step 4: Simplify right side
    85.38x = 9,446.02
  5. Step 5: Solve for x
    x = 9,446.02/85.38
  6. Step 6: Final answer
    x = 110.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.