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Finding the Fourth Proportional to 487.35, 672.78 and 382.20

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Solution

The fourth proportional to 487.35, 672.78 and 382.20 is: 527.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.35 : 672.78 = 382.20 : x
  2. Step 2: Convert to fraction form
    487.35/672.78 = 382.20/x
  3. Step 3: Cross multiply
    487.35x = 672.78 × 382.20
  4. Step 4: Simplify right side
    487.35x = 257,136.52
  5. Step 5: Solve for x
    x = 257,136.52/487.35
  6. Step 6: Final answer
    x = 527.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.