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Finding the Fourth Proportional to 6,399.66, 8,831.55 and 3,711.40

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Solution

The fourth proportional to 6,399.66, 8,831.55 and 3,711.40 is: 5,121.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,399.66 : 8,831.55 = 3,711.40 : x
  2. Step 2: Convert to fraction form
    6,399.66/8,831.55 = 3,711.40/x
  3. Step 3: Cross multiply
    6,399.66x = 8,831.55 × 3,711.40
  4. Step 4: Simplify right side
    6,399.66x = 32,777,435.31
  5. Step 5: Solve for x
    x = 32,777,435.31/6,399.66
  6. Step 6: Final answer
    x = 5,121.75

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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.