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Finding the Third Proportional to 258,720 and 386,484

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Solution

The third proportional to 258,720 and 386,484 is: 577,341.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,720 : 386,484 = 386,484 : x
  2. Step 2: Convert to fraction form
    258,720/386,484 = 386,484/x
  3. Step 3: Cross multiply
    258,720x = 386,484 × 386,484
  4. Step 4: Simplify right side
    258,720x = 149,369,882,256
  5. Step 5: Solve for x
    x = 149,369,882,256/258,720
  6. Step 6: Final answer
    x = 577,341.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.