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Finding the Fourth Proportional to 15,885.60, 21,920.67 and 8,811.78

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Solution

The fourth proportional to 15,885.60, 21,920.67 and 8,811.78 is: 12,159.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.60 : 21,920.67 = 8,811.78 : x
  2. Step 2: Convert to fraction form
    15,885.60/21,920.67 = 8,811.78/x
  3. Step 3: Cross multiply
    15,885.60x = 21,920.67 × 8,811.78
  4. Step 4: Simplify right side
    15,885.60x = 193,160,121.49
  5. Step 5: Solve for x
    x = 193,160,121.49/15,885.60
  6. Step 6: Final answer
    x = 12,159.45

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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.