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Finding the Fourth Proportional to 97.24, 145.21 and 85.09

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Solution

The fourth proportional to 97.24, 145.21 and 85.09 is: 127.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.24 : 145.21 = 85.09 : x
  2. Step 2: Convert to fraction form
    97.24/145.21 = 85.09/x
  3. Step 3: Cross multiply
    97.24x = 145.21 × 85.09
  4. Step 4: Simplify right side
    97.24x = 12,355.92
  5. Step 5: Solve for x
    x = 12,355.92/97.24
  6. Step 6: Final answer
    x = 127.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.