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Finding the Third Proportional to 272,358 and 420,021

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Solution

The third proportional to 272,358 and 420,021 is: 647,741.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,358 : 420,021 = 420,021 : x
  2. Step 2: Convert to fraction form
    272,358/420,021 = 420,021/x
  3. Step 3: Cross multiply
    272,358x = 420,021 × 420,021
  4. Step 4: Simplify right side
    272,358x = 176,417,640,441
  5. Step 5: Solve for x
    x = 176,417,640,441/272,358
  6. Step 6: Final answer
    x = 647,741.72

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.