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Finding the Fourth Proportional to 78.85, 118.28 and 42.27

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Solution

The fourth proportional to 78.85, 118.28 and 42.27 is: 63.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.85 : 118.28 = 42.27 : x
  2. Step 2: Convert to fraction form
    78.85/118.28 = 42.27/x
  3. Step 3: Cross multiply
    78.85x = 118.28 × 42.27
  4. Step 4: Simplify right side
    78.85x = 4,999.48
  5. Step 5: Solve for x
    x = 4,999.48/78.85
  6. Step 6: Final answer
    x = 63.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.