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Finding the Fourth Proportional to 979.52, 1,351.28 and 793.60

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Solution

The fourth proportional to 979.52, 1,351.28 and 793.60 is: 1,094.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.52 : 1,351.28 = 793.60 : x
  2. Step 2: Convert to fraction form
    979.52/1,351.28 = 793.60/x
  3. Step 3: Cross multiply
    979.52x = 1,351.28 × 793.60
  4. Step 4: Simplify right side
    979.52x = 1,072,375.81
  5. Step 5: Solve for x
    x = 1,072,375.81/979.52
  6. Step 6: Final answer
    x = 1,094.80

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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.