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Finding the Third Proportional to 1,291.50 and 1,972.13

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Solution

The third proportional to 1,291.50 and 1,972.13 is: 3,011.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.50 : 1,972.13 = 1,972.13 : x
  2. Step 2: Convert to fraction form
    1,291.50/1,972.13 = 1,972.13/x
  3. Step 3: Cross multiply
    1,291.50x = 1,972.13 × 1,972.13
  4. Step 4: Simplify right side
    1,291.50x = 3,889,277.02
  5. Step 5: Solve for x
    x = 3,889,277.02/1,291.50
  6. Step 6: Final answer
    x = 3,011.44

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.