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Finding the Fourth Proportional to 424, 639.28 and 339.52

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Solution

The fourth proportional to 424, 639.28 and 339.52 is: 511.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    424 : 639.28 = 339.52 : x
  2. Step 2: Convert to fraction form
    424/639.28 = 339.52/x
  3. Step 3: Cross multiply
    424x = 639.28 × 339.52
  4. Step 4: Simplify right side
    424x = 217,048.35
  5. Step 5: Solve for x
    x = 217,048.35/424
  6. Step 6: Final answer
    x = 511.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.