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Finding the Fourth Proportional to 843.78, 1,265.04 and 432.48

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Solution

The fourth proportional to 843.78, 1,265.04 and 432.48 is: 648.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.78 : 1,265.04 = 432.48 : x
  2. Step 2: Convert to fraction form
    843.78/1,265.04 = 432.48/x
  3. Step 3: Cross multiply
    843.78x = 1,265.04 × 432.48
  4. Step 4: Simplify right side
    843.78x = 547,104.50
  5. Step 5: Solve for x
    x = 547,104.50/843.78
  6. Step 6: Final answer
    x = 648.40

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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.