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Finding the Fourth Proportional to 78.73, 117.44 and 71.74

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Solution

The fourth proportional to 78.73, 117.44 and 71.74 is: 107.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.73 : 117.44 = 71.74 : x
  2. Step 2: Convert to fraction form
    78.73/117.44 = 71.74/x
  3. Step 3: Cross multiply
    78.73x = 117.44 × 71.74
  4. Step 4: Simplify right side
    78.73x = 8,425.15
  5. Step 5: Solve for x
    x = 8,425.15/78.73
  6. Step 6: Final answer
    x = 107.01

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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.