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Finding the Fourth Proportional to 979.92, 1,353.24 and 921.60

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Solution

The fourth proportional to 979.92, 1,353.24 and 921.60 is: 1,272.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.92 : 1,353.24 = 921.60 : x
  2. Step 2: Convert to fraction form
    979.92/1,353.24 = 921.60/x
  3. Step 3: Cross multiply
    979.92x = 1,353.24 × 921.60
  4. Step 4: Simplify right side
    979.92x = 1,247,145.98
  5. Step 5: Solve for x
    x = 1,247,145.98/979.92
  6. Step 6: Final answer
    x = 1,272.70

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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.