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Finding the Fourth Proportional to 21,909.70, 32,815.95 and 8,755.30

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Solution

The fourth proportional to 21,909.70, 32,815.95 and 8,755.30 is: 13,113.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,909.70 : 32,815.95 = 8,755.30 : x
  2. Step 2: Convert to fraction form
    21,909.70/32,815.95 = 8,755.30/x
  3. Step 3: Cross multiply
    21,909.70x = 32,815.95 × 8,755.30
  4. Step 4: Simplify right side
    21,909.70x = 287,313,487.04
  5. Step 5: Solve for x
    x = 287,313,487.04/21,909.70
  6. Step 6: Final answer
    x = 13,113.53

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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.