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Finding the Fourth Proportional to 85.62, 118.10 and 54.53

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Solution

The fourth proportional to 85.62, 118.10 and 54.53 is: 75.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.62 : 118.10 = 54.53 : x
  2. Step 2: Convert to fraction form
    85.62/118.10 = 54.53/x
  3. Step 3: Cross multiply
    85.62x = 118.10 × 54.53
  4. Step 4: Simplify right side
    85.62x = 6,439.13
  5. Step 5: Solve for x
    x = 6,439.13/85.62
  6. Step 6: Final answer
    x = 75.21

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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.