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Finding the Fourth Proportional to 15,535.80, 21,439.94 and 8,821.21

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Solution

The fourth proportional to 15,535.80, 21,439.94 and 8,821.21 is: 12,173.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,535.80 : 21,439.94 = 8,821.21 : x
  2. Step 2: Convert to fraction form
    15,535.80/21,439.94 = 8,821.21/x
  3. Step 3: Cross multiply
    15,535.80x = 21,439.94 × 8,821.21
  4. Step 4: Simplify right side
    15,535.80x = 189,126,181.58
  5. Step 5: Solve for x
    x = 189,126,181.58/15,535.80
  6. Step 6: Final answer
    x = 12,173.57

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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.