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Finding the Fourth Proportional to 755, 1,042.08 and 672.40

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Solution

The fourth proportional to 755, 1,042.08 and 672.40 is: 928.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    755 : 1,042.08 = 672.40 : x
  2. Step 2: Convert to fraction form
    755/1,042.08 = 672.40/x
  3. Step 3: Cross multiply
    755x = 1,042.08 × 672.40
  4. Step 4: Simplify right side
    755x = 700,694.59
  5. Step 5: Solve for x
    x = 700,694.59/755
  6. Step 6: Final answer
    x = 928.07

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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.