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Finding the Fourth Proportional to 710.20, 979.73 and 611.78

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Solution

The fourth proportional to 710.20, 979.73 and 611.78 is: 843.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.20 : 979.73 = 611.78 : x
  2. Step 2: Convert to fraction form
    710.20/979.73 = 611.78/x
  3. Step 3: Cross multiply
    710.20x = 979.73 × 611.78
  4. Step 4: Simplify right side
    710.20x = 599,378.61
  5. Step 5: Solve for x
    x = 599,378.61/710.20
  6. Step 6: Final answer
    x = 843.96

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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.