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Finding the Fourth Proportional to 85.53, 118.20 and 79.14

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Solution

The fourth proportional to 85.53, 118.20 and 79.14 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.53 : 118.20 = 79.14 : x
  2. Step 2: Convert to fraction form
    85.53/118.20 = 79.14/x
  3. Step 3: Cross multiply
    85.53x = 118.20 × 79.14
  4. Step 4: Simplify right side
    85.53x = 9,354.35
  5. Step 5: Solve for x
    x = 9,354.35/85.53
  6. Step 6: Final answer
    x = 109.37

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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.