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Finding the Fourth Proportional to 8,611.30, 11,887.52 and 6,621.16

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Solution

The fourth proportional to 8,611.30, 11,887.52 and 6,621.16 is: 9,140.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.30 : 11,887.52 = 6,621.16 : x
  2. Step 2: Convert to fraction form
    8,611.30/11,887.52 = 6,621.16/x
  3. Step 3: Cross multiply
    8,611.30x = 11,887.52 × 6,621.16
  4. Step 4: Simplify right side
    8,611.30x = 78,709,171.92
  5. Step 5: Solve for x
    x = 78,709,171.92/8,611.30
  6. Step 6: Final answer
    x = 9,140.22

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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.