Home / 3,988.52-5,982.78-1,390.76

Finding the Fourth Proportional to 3,988.52, 5,982.78 and 1,390.76

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Solution

The fourth proportional to 3,988.52, 5,982.78 and 1,390.76 is: 2,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.52 : 5,982.78 = 1,390.76 : x
  2. Step 2: Convert to fraction form
    3,988.52/5,982.78 = 1,390.76/x
  3. Step 3: Cross multiply
    3,988.52x = 5,982.78 × 1,390.76
  4. Step 4: Simplify right side
    3,988.52x = 8,320,611.11
  5. Step 5: Solve for x
    x = 8,320,611.11/3,988.52
  6. Step 6: Final answer
    x = 2,086.14

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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.