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Finding the Fourth Proportional to 649.91, 974.85 and 259.79

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Solution

The fourth proportional to 649.91, 974.85 and 259.79 is: 389.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.91 : 974.85 = 259.79 : x
  2. Step 2: Convert to fraction form
    649.91/974.85 = 259.79/x
  3. Step 3: Cross multiply
    649.91x = 974.85 × 259.79
  4. Step 4: Simplify right side
    649.91x = 253,260.39
  5. Step 5: Solve for x
    x = 253,260.39/649.91
  6. Step 6: Final answer
    x = 389.68

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Similar ratio
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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.