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Finding the Fourth Proportional to 3,988.85, 5,503.12 and 3,982.69

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Solution

The fourth proportional to 3,988.85, 5,503.12 and 3,982.69 is: 5,494.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.85 : 5,503.12 = 3,982.69 : x
  2. Step 2: Convert to fraction form
    3,988.85/5,503.12 = 3,982.69/x
  3. Step 3: Cross multiply
    3,988.85x = 5,503.12 × 3,982.69
  4. Step 4: Simplify right side
    3,988.85x = 21,917,209.36
  5. Step 5: Solve for x
    x = 21,917,209.36/3,988.85
  6. Step 6: Final answer
    x = 5,494.63

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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.