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Finding the Third Proportional to 390.56 and 921.84

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Solution

The third proportional to 390.56 and 921.84 is: 2,175.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.56 : 921.84 = 921.84 : x
  2. Step 2: Convert to fraction form
    390.56/921.84 = 921.84/x
  3. Step 3: Cross multiply
    390.56x = 921.84 × 921.84
  4. Step 4: Simplify right side
    390.56x = 849,795.90
  5. Step 5: Solve for x
    x = 849,795.90/390.56
  6. Step 6: Final answer
    x = 2,175.83

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.