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Finding the Third Proportional to 3,139.88 and 4,987.13

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Solution

The third proportional to 3,139.88 and 4,987.13 is: 7,921.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.88 : 4,987.13 = 4,987.13 : x
  2. Step 2: Convert to fraction form
    3,139.88/4,987.13 = 4,987.13/x
  3. Step 3: Cross multiply
    3,139.88x = 4,987.13 × 4,987.13
  4. Step 4: Simplify right side
    3,139.88x = 24,871,415.77
  5. Step 5: Solve for x
    x = 24,871,415.77/3,139.88
  6. Step 6: Final answer
    x = 7,921.15

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.