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Finding the Fourth Proportional to 85.16, 117.38 and 74.90

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Solution

The fourth proportional to 85.16, 117.38 and 74.90 is: 103.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.16 : 117.38 = 74.90 : x
  2. Step 2: Convert to fraction form
    85.16/117.38 = 74.90/x
  3. Step 3: Cross multiply
    85.16x = 117.38 × 74.90
  4. Step 4: Simplify right side
    85.16x = 8,791.76
  5. Step 5: Solve for x
    x = 8,791.76/85.16
  6. Step 6: Final answer
    x = 103.24

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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.