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Finding the Third Proportional to 356,724 and 489,158

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Solution

The third proportional to 356,724 and 489,158 is: 670,758.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    356,724 : 489,158 = 489,158 : x
  2. Step 2: Convert to fraction form
    356,724/489,158 = 489,158/x
  3. Step 3: Cross multiply
    356,724x = 489,158 × 489,158
  4. Step 4: Simplify right side
    356,724x = 239,275,548,964
  5. Step 5: Solve for x
    x = 239,275,548,964/356,724
  6. Step 6: Final answer
    x = 670,758.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.