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Finding the Third Proportional to 142,487 and 221,509

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Solution

The third proportional to 142,487 and 221,509 is: 344,355.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,487 : 221,509 = 221,509 : x
  2. Step 2: Convert to fraction form
    142,487/221,509 = 221,509/x
  3. Step 3: Cross multiply
    142,487x = 221,509 × 221,509
  4. Step 4: Simplify right side
    142,487x = 49,066,237,081
  5. Step 5: Solve for x
    x = 49,066,237,081/142,487
  6. Step 6: Final answer
    x = 344,355.89

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.