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Finding the Fourth Proportional to 3,915.71, 5,395.50 and 2,919.81

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Solution

The fourth proportional to 3,915.71, 5,395.50 and 2,919.81 is: 4,023.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.71 : 5,395.50 = 2,919.81 : x
  2. Step 2: Convert to fraction form
    3,915.71/5,395.50 = 2,919.81/x
  3. Step 3: Cross multiply
    3,915.71x = 5,395.50 × 2,919.81
  4. Step 4: Simplify right side
    3,915.71x = 15,753,834.86
  5. Step 5: Solve for x
    x = 15,753,834.86/3,915.71
  6. Step 6: Final answer
    x = 4,023.24

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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.