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Finding the Fourth Proportional to 649.65, 974.63 and 216.81

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Solution

The fourth proportional to 649.65, 974.63 and 216.81 is: 325.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.65 : 974.63 = 216.81 : x
  2. Step 2: Convert to fraction form
    649.65/974.63 = 216.81/x
  3. Step 3: Cross multiply
    649.65x = 974.63 × 216.81
  4. Step 4: Simplify right side
    649.65x = 211,309.53
  5. Step 5: Solve for x
    x = 211,309.53/649.65
  6. Step 6: Final answer
    x = 325.27

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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.