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Finding the Third Proportional to 438.38 and 614.63

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Solution

The third proportional to 438.38 and 614.63 is: 861.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.38 : 614.63 = 614.63 : x
  2. Step 2: Convert to fraction form
    438.38/614.63 = 614.63/x
  3. Step 3: Cross multiply
    438.38x = 614.63 × 614.63
  4. Step 4: Simplify right side
    438.38x = 377,763.89
  5. Step 5: Solve for x
    x = 377,763.89/438.38
  6. Step 6: Final answer
    x = 861.74

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.