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Finding the Fourth Proportional to 78.82, 117.27 and 78.24

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Solution

The fourth proportional to 78.82, 117.27 and 78.24 is: 116.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.82 : 117.27 = 78.24 : x
  2. Step 2: Convert to fraction form
    78.82/117.27 = 78.24/x
  3. Step 3: Cross multiply
    78.82x = 117.27 × 78.24
  4. Step 4: Simplify right side
    78.82x = 9,175.20
  5. Step 5: Solve for x
    x = 9,175.20/78.82
  6. Step 6: Final answer
    x = 116.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.