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Finding the Fourth Proportional to 97.31, 145.90 and 83.81

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Solution

The fourth proportional to 97.31, 145.90 and 83.81 is: 125.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.31 : 145.90 = 83.81 : x
  2. Step 2: Convert to fraction form
    97.31/145.90 = 83.81/x
  3. Step 3: Cross multiply
    97.31x = 145.90 × 83.81
  4. Step 4: Simplify right side
    97.31x = 12,228.35
  5. Step 5: Solve for x
    x = 12,228.35/97.31
  6. Step 6: Final answer
    x = 125.66

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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.