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Finding the Fourth Proportional to 979.21, 1,351.36 and 606.39

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Solution

The fourth proportional to 979.21, 1,351.36 and 606.39 is: 836.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.21 : 1,351.36 = 606.39 : x
  2. Step 2: Convert to fraction form
    979.21/1,351.36 = 606.39/x
  3. Step 3: Cross multiply
    979.21x = 1,351.36 × 606.39
  4. Step 4: Simplify right side
    979.21x = 819,451.19
  5. Step 5: Solve for x
    x = 819,451.19/979.21
  6. Step 6: Final answer
    x = 836.85

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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.