Home / 3,988.18-5,511.28-2,991.73

Finding the Fourth Proportional to 3,988.18, 5,511.28 and 2,991.73

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Solution

The fourth proportional to 3,988.18, 5,511.28 and 2,991.73 is: 4,134.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.18 : 5,511.28 = 2,991.73 : x
  2. Step 2: Convert to fraction form
    3,988.18/5,511.28 = 2,991.73/x
  3. Step 3: Cross multiply
    3,988.18x = 5,511.28 × 2,991.73
  4. Step 4: Simplify right side
    3,988.18x = 16,488,261.71
  5. Step 5: Solve for x
    x = 16,488,261.71/3,988.18
  6. Step 6: Final answer
    x = 4,134.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.