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Finding the Fourth Proportional to 843, 1,264.13 and 426.28

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Solution

The fourth proportional to 843, 1,264.13 and 426.28 is: 639.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    843 : 1,264.13 = 426.28 : x
  2. Step 2: Convert to fraction form
    843/1,264.13 = 426.28/x
  3. Step 3: Cross multiply
    843x = 1,264.13 × 426.28
  4. Step 4: Simplify right side
    843x = 538,867.02
  5. Step 5: Solve for x
    x = 538,867.02/843
  6. Step 6: Final answer
    x = 639.23

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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.