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Finding the Fourth Proportional to 649.32, 974.34 and 216.60

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Solution

The fourth proportional to 649.32, 974.34 and 216.60 is: 325.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.32 : 974.34 = 216.60 : x
  2. Step 2: Convert to fraction form
    649.32/974.34 = 216.60/x
  3. Step 3: Cross multiply
    649.32x = 974.34 × 216.60
  4. Step 4: Simplify right side
    649.32x = 211,042.04
  5. Step 5: Solve for x
    x = 211,042.04/649.32
  6. Step 6: Final answer
    x = 325.02

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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.