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Finding the Third Proportional to 1,275.75 and 2,491.70

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Solution

The third proportional to 1,275.75 and 2,491.70 is: 4,866.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.75 : 2,491.70 = 2,491.70 : x
  2. Step 2: Convert to fraction form
    1,275.75/2,491.70 = 2,491.70/x
  3. Step 3: Cross multiply
    1,275.75x = 2,491.70 × 2,491.70
  4. Step 4: Simplify right side
    1,275.75x = 6,208,565.00
  5. Step 5: Solve for x
    x = 6,208,565.00/1,275.75
  6. Step 6: Final answer
    x = 4,866.60

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.