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Finding the Third Proportional to 218,711 and 316,078

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Solution

The third proportional to 218,711 and 316,078 is: 456,791.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,711 : 316,078 = 316,078 : x
  2. Step 2: Convert to fraction form
    218,711/316,078 = 316,078/x
  3. Step 3: Cross multiply
    218,711x = 316,078 × 316,078
  4. Step 4: Simplify right side
    218,711x = 99,905,302,084
  5. Step 5: Solve for x
    x = 99,905,302,084/218,711
  6. Step 6: Final answer
    x = 456,791.39

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.