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Finding the Fourth Proportional to 15,635.56, 21,575.07 and 8,920.80

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Solution

The fourth proportional to 15,635.56, 21,575.07 and 8,920.80 is: 12,309.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,635.56 : 21,575.07 = 8,920.80 : x
  2. Step 2: Convert to fraction form
    15,635.56/21,575.07 = 8,920.80/x
  3. Step 3: Cross multiply
    15,635.56x = 21,575.07 × 8,920.80
  4. Step 4: Simplify right side
    15,635.56x = 192,466,884.46
  5. Step 5: Solve for x
    x = 192,466,884.46/15,635.56
  6. Step 6: Final answer
    x = 12,309.56

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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.