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Finding the Fourth Proportional to 15,885.37, 21,921.25 and 8,812.45

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Solution

The fourth proportional to 15,885.37, 21,921.25 and 8,812.45 is: 12,160.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.37 : 21,921.25 = 8,812.45 : x
  2. Step 2: Convert to fraction form
    15,885.37/21,921.25 = 8,812.45/x
  3. Step 3: Cross multiply
    15,885.37x = 21,921.25 × 8,812.45
  4. Step 4: Simplify right side
    15,885.37x = 193,179,765.89
  5. Step 5: Solve for x
    x = 193,179,765.89/15,885.37
  6. Step 6: Final answer
    x = 12,160.86

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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.