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Finding the Fourth Proportional to 97.30, 145.97 and 43.21

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Solution

The fourth proportional to 97.30, 145.97 and 43.21 is: 64.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.30 : 145.97 = 43.21 : x
  2. Step 2: Convert to fraction form
    97.30/145.97 = 43.21/x
  3. Step 3: Cross multiply
    97.30x = 145.97 × 43.21
  4. Step 4: Simplify right side
    97.30x = 6,306.42
  5. Step 5: Solve for x
    x = 6,306.42/97.30
  6. Step 6: Final answer
    x = 64.82

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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.