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Finding the Fourth Proportional to 709.31, 979.11 and 609.32

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Solution

The fourth proportional to 709.31, 979.11 and 609.32 is: 841.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.31 : 979.11 = 609.32 : x
  2. Step 2: Convert to fraction form
    709.31/979.11 = 609.32/x
  3. Step 3: Cross multiply
    709.31x = 979.11 × 609.32
  4. Step 4: Simplify right side
    709.31x = 596,593.75
  5. Step 5: Solve for x
    x = 596,593.75/709.31
  6. Step 6: Final answer
    x = 841.09

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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.