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Finding the Third Proportional to 1,311.19 and 2,116.13

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Solution

The third proportional to 1,311.19 and 2,116.13 is: 3,415.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.19 : 2,116.13 = 2,116.13 : x
  2. Step 2: Convert to fraction form
    1,311.19/2,116.13 = 2,116.13/x
  3. Step 3: Cross multiply
    1,311.19x = 2,116.13 × 2,116.13
  4. Step 4: Simplify right side
    1,311.19x = 4,477,985.02
  5. Step 5: Solve for x
    x = 4,477,985.02/1,311.19
  6. Step 6: Final answer
    x = 3,415.21

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.