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Finding the Fourth Proportional to 630.29, 869.86 and 381.68

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Solution

The fourth proportional to 630.29, 869.86 and 381.68 is: 526.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.29 : 869.86 = 381.68 : x
  2. Step 2: Convert to fraction form
    630.29/869.86 = 381.68/x
  3. Step 3: Cross multiply
    630.29x = 869.86 × 381.68
  4. Step 4: Simplify right side
    630.29x = 332,001.91
  5. Step 5: Solve for x
    x = 332,001.91/630.29
  6. Step 6: Final answer
    x = 526.75

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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.