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Finding the Fourth Proportional to 630.67, 870.34 and 381.95

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Solution

The fourth proportional to 630.67, 870.34 and 381.95 is: 527.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.67 : 870.34 = 381.95 : x
  2. Step 2: Convert to fraction form
    630.67/870.34 = 381.95/x
  3. Step 3: Cross multiply
    630.67x = 870.34 × 381.95
  4. Step 4: Simplify right side
    630.67x = 332,422.01
  5. Step 5: Solve for x
    x = 332,422.01/630.67
  6. Step 6: Final answer
    x = 527.09

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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.