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Finding the Third Proportional to 291.38 and 630.56

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Solution

The third proportional to 291.38 and 630.56 is: 1,364.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.38 : 630.56 = 630.56 : x
  2. Step 2: Convert to fraction form
    291.38/630.56 = 630.56/x
  3. Step 3: Cross multiply
    291.38x = 630.56 × 630.56
  4. Step 4: Simplify right side
    291.38x = 397,609.07
  5. Step 5: Solve for x
    x = 397,609.07/291.38
  6. Step 6: Final answer
    x = 1,364.60

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.