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Finding the Fourth Proportional to 459.87, 690.20 and 216.46

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Solution

The fourth proportional to 459.87, 690.20 and 216.46 is: 324.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.87 : 690.20 = 216.46 : x
  2. Step 2: Convert to fraction form
    459.87/690.20 = 216.46/x
  3. Step 3: Cross multiply
    459.87x = 690.20 × 216.46
  4. Step 4: Simplify right side
    459.87x = 149,400.69
  5. Step 5: Solve for x
    x = 149,400.69/459.87
  6. Step 6: Final answer
    x = 324.88

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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.