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Finding the Fourth Proportional to 3,915.99, 5,404.05 and 2,147.70

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Solution

The fourth proportional to 3,915.99, 5,404.05 and 2,147.70 is: 2,963.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.99 : 5,404.05 = 2,147.70 : x
  2. Step 2: Convert to fraction form
    3,915.99/5,404.05 = 2,147.70/x
  3. Step 3: Cross multiply
    3,915.99x = 5,404.05 × 2,147.70
  4. Step 4: Simplify right side
    3,915.99x = 11,606,278.19
  5. Step 5: Solve for x
    x = 11,606,278.19/3,915.99
  6. Step 6: Final answer
    x = 2,963.82

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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.