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Finding the Third Proportional to 177,915 and 390,822

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Solution

The third proportional to 177,915 and 390,822 is: 858,510.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    177,915 : 390,822 = 390,822 : x
  2. Step 2: Convert to fraction form
    177,915/390,822 = 390,822/x
  3. Step 3: Cross multiply
    177,915x = 390,822 × 390,822
  4. Step 4: Simplify right side
    177,915x = 152,741,835,684
  5. Step 5: Solve for x
    x = 152,741,835,684/177,915
  6. Step 6: Final answer
    x = 858,510.16

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.