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Finding the Fourth Proportional to 85.20, 118.68 and 85.02

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Solution

The fourth proportional to 85.20, 118.68 and 85.02 is: 118.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.20 : 118.68 = 85.02 : x
  2. Step 2: Convert to fraction form
    85.20/118.68 = 85.02/x
  3. Step 3: Cross multiply
    85.20x = 118.68 × 85.02
  4. Step 4: Simplify right side
    85.20x = 10,090.17
  5. Step 5: Solve for x
    x = 10,090.17/85.20
  6. Step 6: Final answer
    x = 118.43

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.