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Finding the Fourth Proportional to 772.97, 1,159.38 and 426.19

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Solution

The fourth proportional to 772.97, 1,159.38 and 426.19 is: 639.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.97 : 1,159.38 = 426.19 : x
  2. Step 2: Convert to fraction form
    772.97/1,159.38 = 426.19/x
  3. Step 3: Cross multiply
    772.97x = 1,159.38 × 426.19
  4. Step 4: Simplify right side
    772.97x = 494,116.16
  5. Step 5: Solve for x
    x = 494,116.16/772.97
  6. Step 6: Final answer
    x = 639.24

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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.