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Finding the Fourth Proportional to 21,803.60, 32,716.20 and 8,656.40

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Solution

The fourth proportional to 21,803.60, 32,716.20 and 8,656.40 is: 12,988.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,803.60 : 32,716.20 = 8,656.40 : x
  2. Step 2: Convert to fraction form
    21,803.60/32,716.20 = 8,656.40/x
  3. Step 3: Cross multiply
    21,803.60x = 32,716.20 × 8,656.40
  4. Step 4: Simplify right side
    21,803.60x = 283,204,513.68
  5. Step 5: Solve for x
    x = 283,204,513.68/21,803.60
  6. Step 6: Final answer
    x = 12,988.89

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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.