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Finding the Fourth Proportional to 778.48, 1,073.48 and 660.24

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Solution

The fourth proportional to 778.48, 1,073.48 and 660.24 is: 910.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.48 : 1,073.48 = 660.24 : x
  2. Step 2: Convert to fraction form
    778.48/1,073.48 = 660.24/x
  3. Step 3: Cross multiply
    778.48x = 1,073.48 × 660.24
  4. Step 4: Simplify right side
    778.48x = 708,754.44
  5. Step 5: Solve for x
    x = 708,754.44/778.48
  6. Step 6: Final answer
    x = 910.43

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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.