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Finding the Fourth Proportional to 979.29, 1,351.76 and 666.16

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Solution

The fourth proportional to 979.29, 1,351.76 and 666.16 is: 919.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.29 : 1,351.76 = 666.16 : x
  2. Step 2: Convert to fraction form
    979.29/1,351.76 = 666.16/x
  3. Step 3: Cross multiply
    979.29x = 1,351.76 × 666.16
  4. Step 4: Simplify right side
    979.29x = 900,481.73
  5. Step 5: Solve for x
    x = 900,481.73/979.29
  6. Step 6: Final answer
    x = 919.53

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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.