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Finding the Fourth Proportional to 15,885.90, 21,921.72 and 8,812.14

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Solution

The fourth proportional to 15,885.90, 21,921.72 and 8,812.14 is: 12,160.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.90 : 21,921.72 = 8,812.14 : x
  2. Step 2: Convert to fraction form
    15,885.90/21,921.72 = 8,812.14/x
  3. Step 3: Cross multiply
    15,885.90x = 21,921.72 × 8,812.14
  4. Step 4: Simplify right side
    15,885.90x = 193,177,265.68
  5. Step 5: Solve for x
    x = 193,177,265.68/15,885.90
  6. Step 6: Final answer
    x = 12,160.30

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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.