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Finding the Third Proportional to 278.38 and 399.13

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Solution

The third proportional to 278.38 and 399.13 is: 572.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.38 : 399.13 = 399.13 : x
  2. Step 2: Convert to fraction form
    278.38/399.13 = 399.13/x
  3. Step 3: Cross multiply
    278.38x = 399.13 × 399.13
  4. Step 4: Simplify right side
    278.38x = 159,300.77
  5. Step 5: Solve for x
    x = 159,300.77/278.38
  6. Step 6: Final answer
    x = 572.25

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.