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Finding the Third Proportional to 315.14 and 661.92

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Solution

The third proportional to 315.14 and 661.92 is: 1,390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.14 : 661.92 = 661.92 : x
  2. Step 2: Convert to fraction form
    315.14/661.92 = 661.92/x
  3. Step 3: Cross multiply
    315.14x = 661.92 × 661.92
  4. Step 4: Simplify right side
    315.14x = 438,140.57
  5. Step 5: Solve for x
    x = 438,140.57/315.14
  6. Step 6: Final answer
    x = 1,390.30

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.