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Finding the Third Proportional to 255,978 and 558,540

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Solution

The third proportional to 255,978 and 558,540 is: 1,218,725.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,978 : 558,540 = 558,540 : x
  2. Step 2: Convert to fraction form
    255,978/558,540 = 558,540/x
  3. Step 3: Cross multiply
    255,978x = 558,540 × 558,540
  4. Step 4: Simplify right side
    255,978x = 311,966,931,600
  5. Step 5: Solve for x
    x = 311,966,931,600/255,978
  6. Step 6: Final answer
    x = 1,218,725.56

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.