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Finding the Fourth Proportional to 5,643.86, 8,478.77 and 3,981.81

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Solution

The fourth proportional to 5,643.86, 8,478.77 and 3,981.81 is: 5,981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,643.86 : 8,478.77 = 3,981.81 : x
  2. Step 2: Convert to fraction form
    5,643.86/8,478.77 = 3,981.81/x
  3. Step 3: Cross multiply
    5,643.86x = 8,478.77 × 3,981.81
  4. Step 4: Simplify right side
    5,643.86x = 33,760,831.26
  5. Step 5: Solve for x
    x = 33,760,831.26/5,643.86
  6. Step 6: Final answer
    x = 5,981.87

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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.