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Finding the Fourth Proportional to 979.56, 1,351.08 and 648.27

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Solution

The fourth proportional to 979.56, 1,351.08 and 648.27 is: 894.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.56 : 1,351.08 = 648.27 : x
  2. Step 2: Convert to fraction form
    979.56/1,351.08 = 648.27/x
  3. Step 3: Cross multiply
    979.56x = 1,351.08 × 648.27
  4. Step 4: Simplify right side
    979.56x = 875,864.63
  5. Step 5: Solve for x
    x = 875,864.63/979.56
  6. Step 6: Final answer
    x = 894.14

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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.