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Finding the Fourth Proportional to 630.88, 870.68 and 382.21

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Solution

The fourth proportional to 630.88, 870.68 and 382.21 is: 527.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.88 : 870.68 = 382.21 : x
  2. Step 2: Convert to fraction form
    630.88/870.68 = 382.21/x
  3. Step 3: Cross multiply
    630.88x = 870.68 × 382.21
  4. Step 4: Simplify right side
    630.88x = 332,778.52
  5. Step 5: Solve for x
    x = 332,778.52/630.88
  6. Step 6: Final answer
    x = 527.49

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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.