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Finding the Fourth Proportional to 15,885.25, 21,921.65 and 8,811.67

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Solution

The fourth proportional to 15,885.25, 21,921.65 and 8,811.67 is: 12,160.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.25 : 21,921.65 = 8,811.67 : x
  2. Step 2: Convert to fraction form
    15,885.25/21,921.65 = 8,811.67/x
  3. Step 3: Cross multiply
    15,885.25x = 21,921.65 × 8,811.67
  4. Step 4: Simplify right side
    15,885.25x = 193,166,345.66
  5. Step 5: Solve for x
    x = 193,166,345.66/15,885.25
  6. Step 6: Final answer
    x = 12,160.11

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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.