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Finding the Fourth Proportional to 979.11, 1,352.15 and 820.14

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Solution

The fourth proportional to 979.11, 1,352.15 and 820.14 is: 1,132.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.11 : 1,352.15 = 820.14 : x
  2. Step 2: Convert to fraction form
    979.11/1,352.15 = 820.14/x
  3. Step 3: Cross multiply
    979.11x = 1,352.15 × 820.14
  4. Step 4: Simplify right side
    979.11x = 1,108,952.30
  5. Step 5: Solve for x
    x = 1,108,952.30/979.11
  6. Step 6: Final answer
    x = 1,132.61

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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.