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Finding the Fourth Proportional to 709.31, 979.10 and 440.34

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Solution

The fourth proportional to 709.31, 979.10 and 440.34 is: 607.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.31 : 979.10 = 440.34 : x
  2. Step 2: Convert to fraction form
    709.31/979.10 = 440.34/x
  3. Step 3: Cross multiply
    709.31x = 979.10 × 440.34
  4. Step 4: Simplify right side
    709.31x = 431,134.69
  5. Step 5: Solve for x
    x = 431,134.69/709.31
  6. Step 6: Final answer
    x = 607.82

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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.