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Finding the Fourth Proportional to 97.68, 145.90 and 85.44

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Solution

The fourth proportional to 97.68, 145.90 and 85.44 is: 127.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.68 : 145.90 = 85.44 : x
  2. Step 2: Convert to fraction form
    97.68/145.90 = 85.44/x
  3. Step 3: Cross multiply
    97.68x = 145.90 × 85.44
  4. Step 4: Simplify right side
    97.68x = 12,465.70
  5. Step 5: Solve for x
    x = 12,465.70/97.68
  6. Step 6: Final answer
    x = 127.62

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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.