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Finding the Third Proportional to 78,438 and 118,386

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Solution

The third proportional to 78,438 and 118,386 is: 178,679.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,438 : 118,386 = 118,386 : x
  2. Step 2: Convert to fraction form
    78,438/118,386 = 118,386/x
  3. Step 3: Cross multiply
    78,438x = 118,386 × 118,386
  4. Step 4: Simplify right side
    78,438x = 14,015,244,996
  5. Step 5: Solve for x
    x = 14,015,244,996/78,438
  6. Step 6: Final answer
    x = 178,679.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.