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Finding the Fourth Proportional to 410.20, 614.88 and 399.68

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Solution

The fourth proportional to 410.20, 614.88 and 399.68 is: 599.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.20 : 614.88 = 399.68 : x
  2. Step 2: Convert to fraction form
    410.20/614.88 = 399.68/x
  3. Step 3: Cross multiply
    410.20x = 614.88 × 399.68
  4. Step 4: Simplify right side
    410.20x = 245,755.24
  5. Step 5: Solve for x
    x = 245,755.24/410.20
  6. Step 6: Final answer
    x = 599.11

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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.