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Finding the Fourth Proportional to 766.54, 1,057.81 and 447.57

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Solution

The fourth proportional to 766.54, 1,057.81 and 447.57 is: 617.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.54 : 1,057.81 = 447.57 : x
  2. Step 2: Convert to fraction form
    766.54/1,057.81 = 447.57/x
  3. Step 3: Cross multiply
    766.54x = 1,057.81 × 447.57
  4. Step 4: Simplify right side
    766.54x = 473,441.78
  5. Step 5: Solve for x
    x = 473,441.78/766.54
  6. Step 6: Final answer
    x = 617.63

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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.