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Finding the Third Proportional to 291.75 and 619.13

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Solution

The third proportional to 291.75 and 619.13 is: 1,313.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.75 : 619.13 = 619.13 : x
  2. Step 2: Convert to fraction form
    291.75/619.13 = 619.13/x
  3. Step 3: Cross multiply
    291.75x = 619.13 × 619.13
  4. Step 4: Simplify right side
    291.75x = 383,315.77
  5. Step 5: Solve for x
    x = 383,315.77/291.75
  6. Step 6: Final answer
    x = 1,313.85

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.