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Finding the Fourth Proportional to 979.20, 1,351.58 and 684.54

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Solution

The fourth proportional to 979.20, 1,351.58 and 684.54 is: 944.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.20 : 1,351.58 = 684.54 : x
  2. Step 2: Convert to fraction form
    979.20/1,351.58 = 684.54/x
  3. Step 3: Cross multiply
    979.20x = 1,351.58 × 684.54
  4. Step 4: Simplify right side
    979.20x = 925,207.15
  5. Step 5: Solve for x
    x = 925,207.15/979.20
  6. Step 6: Final answer
    x = 944.86

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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.