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Finding the Fourth Proportional to 15,885.60, 21,920.57 and 8,811.88

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Solution

The fourth proportional to 15,885.60, 21,920.57 and 8,811.88 is: 12,159.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.60 : 21,920.57 = 8,811.88 : x
  2. Step 2: Convert to fraction form
    15,885.60/21,920.57 = 8,811.88/x
  3. Step 3: Cross multiply
    15,885.60x = 21,920.57 × 8,811.88
  4. Step 4: Simplify right side
    15,885.60x = 193,161,432.37
  5. Step 5: Solve for x
    x = 193,161,432.37/15,885.60
  6. Step 6: Final answer
    x = 12,159.53

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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.