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Finding the Third Proportional to 387.84 and 845.40

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Solution

The third proportional to 387.84 and 845.40 is: 1,842.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.84 : 845.40 = 845.40 : x
  2. Step 2: Convert to fraction form
    387.84/845.40 = 845.40/x
  3. Step 3: Cross multiply
    387.84x = 845.40 × 845.40
  4. Step 4: Simplify right side
    387.84x = 714,705.12
  5. Step 5: Solve for x
    x = 714,705.12/387.84
  6. Step 6: Final answer
    x = 1,842.77

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.