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Finding the Fourth Proportional to 552.96, 762.78 and 387.42

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Solution

The fourth proportional to 552.96, 762.78 and 387.42 is: 534.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.96 : 762.78 = 387.42 : x
  2. Step 2: Convert to fraction form
    552.96/762.78 = 387.42/x
  3. Step 3: Cross multiply
    552.96x = 762.78 × 387.42
  4. Step 4: Simplify right side
    552.96x = 295,516.23
  5. Step 5: Solve for x
    x = 295,516.23/552.96
  6. Step 6: Final answer
    x = 534.43

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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.