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Finding the Fourth Proportional to 782.24, 1,166.49 and 664.70

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Solution

The fourth proportional to 782.24, 1,166.49 and 664.70 is: 991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.24 : 1,166.49 = 664.70 : x
  2. Step 2: Convert to fraction form
    782.24/1,166.49 = 664.70/x
  3. Step 3: Cross multiply
    782.24x = 1,166.49 × 664.70
  4. Step 4: Simplify right side
    782.24x = 775,360.07
  5. Step 5: Solve for x
    x = 775,360.07/782.24
  6. Step 6: Final answer
    x = 991.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.