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Finding the Third Proportional to 420,666 and 912,309

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Solution

The third proportional to 420,666 and 912,309 is: 1,978,547.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,666 : 912,309 = 912,309 : x
  2. Step 2: Convert to fraction form
    420,666/912,309 = 912,309/x
  3. Step 3: Cross multiply
    420,666x = 912,309 × 912,309
  4. Step 4: Simplify right side
    420,666x = 832,307,711,481
  5. Step 5: Solve for x
    x = 832,307,711,481/420,666
  6. Step 6: Final answer
    x = 1,978,547.62

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.