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Finding the Fourth Proportional to 979.20, 1,350.54 and 668.52

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Solution

The fourth proportional to 979.20, 1,350.54 and 668.52 is: 922.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.20 : 1,350.54 = 668.52 : x
  2. Step 2: Convert to fraction form
    979.20/1,350.54 = 668.52/x
  3. Step 3: Cross multiply
    979.20x = 1,350.54 × 668.52
  4. Step 4: Simplify right side
    979.20x = 902,863.00
  5. Step 5: Solve for x
    x = 902,863.00/979.20
  6. Step 6: Final answer
    x = 922.04

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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.