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Finding the Fourth Proportional to 5,661, 7,811.52 and 3,142.86

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Solution

The fourth proportional to 5,661, 7,811.52 and 3,142.86 is: 4,336.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,661 : 7,811.52 = 3,142.86 : x
  2. Step 2: Convert to fraction form
    5,661/7,811.52 = 3,142.86/x
  3. Step 3: Cross multiply
    5,661x = 7,811.52 × 3,142.86
  4. Step 4: Simplify right side
    5,661x = 24,550,513.75
  5. Step 5: Solve for x
    x = 24,550,513.75/5,661
  6. Step 6: Final answer
    x = 4,336.78

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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.