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Finding the Fourth Proportional to 979.41, 1,351.88 and 630.09

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Solution

The fourth proportional to 979.41, 1,351.88 and 630.09 is: 869.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.41 : 1,351.88 = 630.09 : x
  2. Step 2: Convert to fraction form
    979.41/1,351.88 = 630.09/x
  3. Step 3: Cross multiply
    979.41x = 1,351.88 × 630.09
  4. Step 4: Simplify right side
    979.41x = 851,813.90
  5. Step 5: Solve for x
    x = 851,813.90/979.41
  6. Step 6: Final answer
    x = 869.72

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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.