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Finding the Fourth Proportional to 3,611.05, 4,972.15 and 3,078.75

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Solution

The fourth proportional to 3,611.05, 4,972.15 and 3,078.75 is: 4,239.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,611.05 : 4,972.15 = 3,078.75 : x
  2. Step 2: Convert to fraction form
    3,611.05/4,972.15 = 3,078.75/x
  3. Step 3: Cross multiply
    3,611.05x = 4,972.15 × 3,078.75
  4. Step 4: Simplify right side
    3,611.05x = 15,307,966.56
  5. Step 5: Solve for x
    x = 15,307,966.56/3,611.05
  6. Step 6: Final answer
    x = 4,239.20

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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.