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Finding the Fourth Proportional to 15,885.21, 21,921.55 and 8,715.16

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Solution

The fourth proportional to 15,885.21, 21,921.55 and 8,715.16 is: 12,026.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.21 : 21,921.55 = 8,715.16 : x
  2. Step 2: Convert to fraction form
    15,885.21/21,921.55 = 8,715.16/x
  3. Step 3: Cross multiply
    15,885.21x = 21,921.55 × 8,715.16
  4. Step 4: Simplify right side
    15,885.21x = 191,049,815.70
  5. Step 5: Solve for x
    x = 191,049,815.70/15,885.21
  6. Step 6: Final answer
    x = 12,026.90

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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.