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Finding the Third Proportional to 393.61 and 578.39

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Solution

The third proportional to 393.61 and 578.39 is: 849.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.61 : 578.39 = 578.39 : x
  2. Step 2: Convert to fraction form
    393.61/578.39 = 578.39/x
  3. Step 3: Cross multiply
    393.61x = 578.39 × 578.39
  4. Step 4: Simplify right side
    393.61x = 334,535.72
  5. Step 5: Solve for x
    x = 334,535.72/393.61
  6. Step 6: Final answer
    x = 849.92

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.