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Finding the Fourth Proportional to 3,988.76, 5,984.36 and 2,139.80

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Solution

The fourth proportional to 3,988.76, 5,984.36 and 2,139.80 is: 3,210.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.76 : 5,984.36 = 2,139.80 : x
  2. Step 2: Convert to fraction form
    3,988.76/5,984.36 = 2,139.80/x
  3. Step 3: Cross multiply
    3,988.76x = 5,984.36 × 2,139.80
  4. Step 4: Simplify right side
    3,988.76x = 12,805,333.53
  5. Step 5: Solve for x
    x = 12,805,333.53/3,988.76
  6. Step 6: Final answer
    x = 3,210.35

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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.