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Finding the Third Proportional to 1,390.88 and 2,938.13

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Solution

The third proportional to 1,390.88 and 2,938.13 is: 6,206.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.88 : 2,938.13 = 2,938.13 : x
  2. Step 2: Convert to fraction form
    1,390.88/2,938.13 = 2,938.13/x
  3. Step 3: Cross multiply
    1,390.88x = 2,938.13 × 2,938.13
  4. Step 4: Simplify right side
    1,390.88x = 8,632,578.52
  5. Step 5: Solve for x
    x = 8,632,578.52/1,390.88
  6. Step 6: Final answer
    x = 6,206.58

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.