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Finding the Third Proportional to 81,480 and 178,272

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Solution

The third proportional to 81,480 and 178,272 is: 390,045.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,480 : 178,272 = 178,272 : x
  2. Step 2: Convert to fraction form
    81,480/178,272 = 178,272/x
  3. Step 3: Cross multiply
    81,480x = 178,272 × 178,272
  4. Step 4: Simplify right side
    81,480x = 31,780,905,984
  5. Step 5: Solve for x
    x = 31,780,905,984/81,480
  6. Step 6: Final answer
    x = 390,045.48

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.