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Finding the Fourth Proportional to 778.74, 1,074.42 and 632.34

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Solution

The fourth proportional to 778.74, 1,074.42 and 632.34 is: 872.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.74 : 1,074.42 = 632.34 : x
  2. Step 2: Convert to fraction form
    778.74/1,074.42 = 632.34/x
  3. Step 3: Cross multiply
    778.74x = 1,074.42 × 632.34
  4. Step 4: Simplify right side
    778.74x = 679,398.74
  5. Step 5: Solve for x
    x = 679,398.74/778.74
  6. Step 6: Final answer
    x = 872.43

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1.5x scale

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.