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Finding the Fourth Proportional to 3,858.60, 5,787.90 and 2,611.20

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Solution

The fourth proportional to 3,858.60, 5,787.90 and 2,611.20 is: 3,916.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,858.60 : 5,787.90 = 2,611.20 : x
  2. Step 2: Convert to fraction form
    3,858.60/5,787.90 = 2,611.20/x
  3. Step 3: Cross multiply
    3,858.60x = 5,787.90 × 2,611.20
  4. Step 4: Simplify right side
    3,858.60x = 15,113,364.48
  5. Step 5: Solve for x
    x = 15,113,364.48/3,858.60
  6. Step 6: Final answer
    x = 3,916.80

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1.5x scale

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.