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Finding the Fourth Proportional to 562.39, 842.78 and 479.68

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Solution

The fourth proportional to 562.39, 842.78 and 479.68 is: 718.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.39 : 842.78 = 479.68 : x
  2. Step 2: Convert to fraction form
    562.39/842.78 = 479.68/x
  3. Step 3: Cross multiply
    562.39x = 842.78 × 479.68
  4. Step 4: Simplify right side
    562.39x = 404,258.10
  5. Step 5: Solve for x
    x = 404,258.10/562.39
  6. Step 6: Final answer
    x = 718.83

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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.