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Finding the Fourth Proportional to 424.70, 635.70 and 411.20

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Solution

The fourth proportional to 424.70, 635.70 and 411.20 is: 615.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.70 : 635.70 = 411.20 : x
  2. Step 2: Convert to fraction form
    424.70/635.70 = 411.20/x
  3. Step 3: Cross multiply
    424.70x = 635.70 × 411.20
  4. Step 4: Simplify right side
    424.70x = 261,399.84
  5. Step 5: Solve for x
    x = 261,399.84/424.70
  6. Step 6: Final answer
    x = 615.49

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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.