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Finding the Fourth Proportional to 8,621.68, 11,889.84 and 6,859.12

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Solution

The fourth proportional to 8,621.68, 11,889.84 and 6,859.12 is: 9,459.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621.68 : 11,889.84 = 6,859.12 : x
  2. Step 2: Convert to fraction form
    8,621.68/11,889.84 = 6,859.12/x
  3. Step 3: Cross multiply
    8,621.68x = 11,889.84 × 6,859.12
  4. Step 4: Simplify right side
    8,621.68x = 81,553,839.34
  5. Step 5: Solve for x
    x = 81,553,839.34/8,621.68
  6. Step 6: Final answer
    x = 9,459.16

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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.