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Finding the Fourth Proportional to 78.97, 118.46 and 71.63

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Solution

The fourth proportional to 78.97, 118.46 and 71.63 is: 107.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.97 : 118.46 = 71.63 : x
  2. Step 2: Convert to fraction form
    78.97/118.46 = 71.63/x
  3. Step 3: Cross multiply
    78.97x = 118.46 × 71.63
  4. Step 4: Simplify right side
    78.97x = 8,484.93
  5. Step 5: Solve for x
    x = 8,484.93/78.97
  6. Step 6: Final answer
    x = 107.45

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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.