Home / 5,639.11-7,781.98-3,121.39

Finding the Fourth Proportional to 5,639.11, 7,781.98 and 3,121.39

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Solution

The fourth proportional to 5,639.11, 7,781.98 and 3,121.39 is: 4,307.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.11 : 7,781.98 = 3,121.39 : x
  2. Step 2: Convert to fraction form
    5,639.11/7,781.98 = 3,121.39/x
  3. Step 3: Cross multiply
    5,639.11x = 7,781.98 × 3,121.39
  4. Step 4: Simplify right side
    5,639.11x = 24,290,614.03
  5. Step 5: Solve for x
    x = 24,290,614.03/5,639.11
  6. Step 6: Final answer
    x = 4,307.53

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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.