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Finding the Third Proportional to 285,918 and 420,560

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Solution

The third proportional to 285,918 and 420,560 is: 618,606.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,918 : 420,560 = 420,560 : x
  2. Step 2: Convert to fraction form
    285,918/420,560 = 420,560/x
  3. Step 3: Cross multiply
    285,918x = 420,560 × 420,560
  4. Step 4: Simplify right side
    285,918x = 176,870,713,600
  5. Step 5: Solve for x
    x = 176,870,713,600/285,918
  6. Step 6: Final answer
    x = 618,606.43

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.