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Finding the Third Proportional to 428,560 and 921,618

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Solution

The third proportional to 428,560 and 921,618 is: 1,981,938.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,560 : 921,618 = 921,618 : x
  2. Step 2: Convert to fraction form
    428,560/921,618 = 921,618/x
  3. Step 3: Cross multiply
    428,560x = 921,618 × 921,618
  4. Step 4: Simplify right side
    428,560x = 849,379,737,924
  5. Step 5: Solve for x
    x = 849,379,737,924/428,560
  6. Step 6: Final answer
    x = 1,981,938.91

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.