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Finding the Fourth Proportional to 979.43, 1,351.22 and 606.15

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Solution

The fourth proportional to 979.43, 1,351.22 and 606.15 is: 836.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.43 : 1,351.22 = 606.15 : x
  2. Step 2: Convert to fraction form
    979.43/1,351.22 = 606.15/x
  3. Step 3: Cross multiply
    979.43x = 1,351.22 × 606.15
  4. Step 4: Simplify right side
    979.43x = 819,038.97
  5. Step 5: Solve for x
    x = 819,038.97/979.43
  6. Step 6: Final answer
    x = 836.24

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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.