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Finding the Fourth Proportional to 2,611.14, 3,915.78 and 761.76

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Solution

The fourth proportional to 2,611.14, 3,915.78 and 761.76 is: 1,142.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,611.14 : 3,915.78 = 761.76 : x
  2. Step 2: Convert to fraction form
    2,611.14/3,915.78 = 761.76/x
  3. Step 3: Cross multiply
    2,611.14x = 3,915.78 × 761.76
  4. Step 4: Simplify right side
    2,611.14x = 2,982,884.57
  5. Step 5: Solve for x
    x = 2,982,884.57/2,611.14
  6. Step 6: Final answer
    x = 1,142.37

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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.