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Finding the Fourth Proportional to 843.69, 1,265.75 and 426.20

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Solution

The fourth proportional to 843.69, 1,265.75 and 426.20 is: 639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.69 : 1,265.75 = 426.20 : x
  2. Step 2: Convert to fraction form
    843.69/1,265.75 = 426.20/x
  3. Step 3: Cross multiply
    843.69x = 1,265.75 × 426.20
  4. Step 4: Simplify right side
    843.69x = 539,455.79
  5. Step 5: Solve for x
    x = 539,455.79/843.69
  6. Step 6: Final answer
    x = 639.40

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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.