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Finding the Fourth Proportional to 709.62, 980.40 and 605.80

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Solution

The fourth proportional to 709.62, 980.40 and 605.80 is: 836.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.62 : 980.40 = 605.80 : x
  2. Step 2: Convert to fraction form
    709.62/980.40 = 605.80/x
  3. Step 3: Cross multiply
    709.62x = 980.40 × 605.80
  4. Step 4: Simplify right side
    709.62x = 593,926.32
  5. Step 5: Solve for x
    x = 593,926.32/709.62
  6. Step 6: Final answer
    x = 836.96

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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.