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Finding the Fourth Proportional to 649.68, 974.56 and 216.80

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Solution

The fourth proportional to 649.68, 974.56 and 216.80 is: 325.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.68 : 974.56 = 216.80 : x
  2. Step 2: Convert to fraction form
    649.68/974.56 = 216.80/x
  3. Step 3: Cross multiply
    649.68x = 974.56 × 216.80
  4. Step 4: Simplify right side
    649.68x = 211,284.61
  5. Step 5: Solve for x
    x = 211,284.61/649.68
  6. Step 6: Final answer
    x = 325.21

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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.