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Finding the Fourth Proportional to 979.46, 1,351.23 and 648.35

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Solution

The fourth proportional to 979.46, 1,351.23 and 648.35 is: 894.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.46 : 1,351.23 = 648.35 : x
  2. Step 2: Convert to fraction form
    979.46/1,351.23 = 648.35/x
  3. Step 3: Cross multiply
    979.46x = 1,351.23 × 648.35
  4. Step 4: Simplify right side
    979.46x = 876,063.21
  5. Step 5: Solve for x
    x = 876,063.21/979.46
  6. Step 6: Final answer
    x = 894.44

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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.