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Finding the Fourth Proportional to 97.02, 133.92 and 78.66

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Solution

The fourth proportional to 97.02, 133.92 and 78.66 is: 108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.02 : 133.92 = 78.66 : x
  2. Step 2: Convert to fraction form
    97.02/133.92 = 78.66/x
  3. Step 3: Cross multiply
    97.02x = 133.92 × 78.66
  4. Step 4: Simplify right side
    97.02x = 10,534.15
  5. Step 5: Solve for x
    x = 10,534.15/97.02
  6. Step 6: Final answer
    x = 108.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.