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Finding the Fourth Proportional to 478.74, 717.11 and 286.26

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Solution

The fourth proportional to 478.74, 717.11 and 286.26 is: 428.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.74 : 717.11 = 286.26 : x
  2. Step 2: Convert to fraction form
    478.74/717.11 = 286.26/x
  3. Step 3: Cross multiply
    478.74x = 717.11 × 286.26
  4. Step 4: Simplify right side
    478.74x = 205,279.91
  5. Step 5: Solve for x
    x = 205,279.91/478.74
  6. Step 6: Final answer
    x = 428.79

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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.