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Finding the Fourth Proportional to 649.84, 974.76 and 217.48

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Solution

The fourth proportional to 649.84, 974.76 and 217.48 is: 326.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.84 : 974.76 = 217.48 : x
  2. Step 2: Convert to fraction form
    649.84/974.76 = 217.48/x
  3. Step 3: Cross multiply
    649.84x = 974.76 × 217.48
  4. Step 4: Simplify right side
    649.84x = 211,990.80
  5. Step 5: Solve for x
    x = 211,990.80/649.84
  6. Step 6: Final answer
    x = 326.22

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Double scale
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Similar ratio
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1.5x scale

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.