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Finding the Third Proportional to 619.95 and 1,291.13

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Solution

The third proportional to 619.95 and 1,291.13 is: 2,688.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.95 : 1,291.13 = 1,291.13 : x
  2. Step 2: Convert to fraction form
    619.95/1,291.13 = 1,291.13/x
  3. Step 3: Cross multiply
    619.95x = 1,291.13 × 1,291.13
  4. Step 4: Simplify right side
    619.95x = 1,667,003.77
  5. Step 5: Solve for x
    x = 1,667,003.77/619.95
  6. Step 6: Final answer
    x = 2,688.95

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.