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Finding the Fourth Proportional to 97.05, 145.34 and 80.68

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Solution

The fourth proportional to 97.05, 145.34 and 80.68 is: 120.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.05 : 145.34 = 80.68 : x
  2. Step 2: Convert to fraction form
    97.05/145.34 = 80.68/x
  3. Step 3: Cross multiply
    97.05x = 145.34 × 80.68
  4. Step 4: Simplify right side
    97.05x = 11,726.03
  5. Step 5: Solve for x
    x = 11,726.03/97.05
  6. Step 6: Final answer
    x = 120.82

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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.