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Finding the Fourth Proportional to 410.19, 615.28 and 399.86

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Solution

The fourth proportional to 410.19, 615.28 and 399.86 is: 599.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.19 : 615.28 = 399.86 : x
  2. Step 2: Convert to fraction form
    410.19/615.28 = 399.86/x
  3. Step 3: Cross multiply
    410.19x = 615.28 × 399.86
  4. Step 4: Simplify right side
    410.19x = 246,026.36
  5. Step 5: Solve for x
    x = 246,026.36/410.19
  6. Step 6: Final answer
    x = 599.79

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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.