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Finding the Fourth Proportional to 772.99, 1,159.62 and 426.18

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Solution

The fourth proportional to 772.99, 1,159.62 and 426.18 is: 639.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.99 : 1,159.62 = 426.18 : x
  2. Step 2: Convert to fraction form
    772.99/1,159.62 = 426.18/x
  3. Step 3: Cross multiply
    772.99x = 1,159.62 × 426.18
  4. Step 4: Simplify right side
    772.99x = 494,201.05
  5. Step 5: Solve for x
    x = 494,201.05/772.99
  6. Step 6: Final answer
    x = 639.34

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1.5x scale

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.