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Finding the Fourth Proportional to 424.48, 636.04 and 399.40

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Solution

The fourth proportional to 424.48, 636.04 and 399.40 is: 598.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.48 : 636.04 = 399.40 : x
  2. Step 2: Convert to fraction form
    424.48/636.04 = 399.40/x
  3. Step 3: Cross multiply
    424.48x = 636.04 × 399.40
  4. Step 4: Simplify right side
    424.48x = 254,034.38
  5. Step 5: Solve for x
    x = 254,034.38/424.48
  6. Step 6: Final answer
    x = 598.46

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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.