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Finding the Fourth Proportional to 820.70, 1,232.85 and 605.66

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Solution

The fourth proportional to 820.70, 1,232.85 and 605.66 is: 909.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.70 : 1,232.85 = 605.66 : x
  2. Step 2: Convert to fraction form
    820.70/1,232.85 = 605.66/x
  3. Step 3: Cross multiply
    820.70x = 1,232.85 × 605.66
  4. Step 4: Simplify right side
    820.70x = 746,687.93
  5. Step 5: Solve for x
    x = 746,687.93/820.70
  6. Step 6: Final answer
    x = 909.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.