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Finding the Fourth Proportional to 630.46, 869.91 and 381.91

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Solution

The fourth proportional to 630.46, 869.91 and 381.91 is: 526.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.46 : 869.91 = 381.91 : x
  2. Step 2: Convert to fraction form
    630.46/869.91 = 381.91/x
  3. Step 3: Cross multiply
    630.46x = 869.91 × 381.91
  4. Step 4: Simplify right side
    630.46x = 332,227.33
  5. Step 5: Solve for x
    x = 332,227.33/630.46
  6. Step 6: Final answer
    x = 526.96

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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.