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Finding the Third Proportional to 64,320 and 138,432

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Solution

The third proportional to 64,320 and 138,432 is: 297,938.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,320 : 138,432 = 138,432 : x
  2. Step 2: Convert to fraction form
    64,320/138,432 = 138,432/x
  3. Step 3: Cross multiply
    64,320x = 138,432 × 138,432
  4. Step 4: Simplify right side
    64,320x = 19,163,418,624
  5. Step 5: Solve for x
    x = 19,163,418,624/64,320
  6. Step 6: Final answer
    x = 297,938.72

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.