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Finding the Fourth Proportional to 979.02, 1,351.12 and 713.54

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Solution

The fourth proportional to 979.02, 1,351.12 and 713.54 is: 984.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.02 : 1,351.12 = 713.54 : x
  2. Step 2: Convert to fraction form
    979.02/1,351.12 = 713.54/x
  3. Step 3: Cross multiply
    979.02x = 1,351.12 × 713.54
  4. Step 4: Simplify right side
    979.02x = 964,078.16
  5. Step 5: Solve for x
    x = 964,078.16/979.02
  6. Step 6: Final answer
    x = 984.74

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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.