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Finding the Fourth Proportional to 782.11, 1,079.34 and 432.80

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Solution

The fourth proportional to 782.11, 1,079.34 and 432.80 is: 597.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.11 : 1,079.34 = 432.80 : x
  2. Step 2: Convert to fraction form
    782.11/1,079.34 = 432.80/x
  3. Step 3: Cross multiply
    782.11x = 1,079.34 × 432.80
  4. Step 4: Simplify right side
    782.11x = 467,138.35
  5. Step 5: Solve for x
    x = 467,138.35/782.11
  6. Step 6: Final answer
    x = 597.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.