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Finding the Fourth Proportional to 8,621.64, 12,937.86 and 3,940.92

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Solution

The fourth proportional to 8,621.64, 12,937.86 and 3,940.92 is: 5,913.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621.64 : 12,937.86 = 3,940.92 : x
  2. Step 2: Convert to fraction form
    8,621.64/12,937.86 = 3,940.92/x
  3. Step 3: Cross multiply
    8,621.64x = 12,937.86 × 3,940.92
  4. Step 4: Simplify right side
    8,621.64x = 50,987,071.23
  5. Step 5: Solve for x
    x = 50,987,071.23/8,621.64
  6. Step 6: Final answer
    x = 5,913.85

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1.5x scale

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.