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Finding the Fourth Proportional to 15,887.21, 21,926.98 and 8,815.91

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Solution

The fourth proportional to 15,887.21, 21,926.98 and 8,815.91 is: 12,167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,887.21 : 21,926.98 = 8,815.91 : x
  2. Step 2: Convert to fraction form
    15,887.21/21,926.98 = 8,815.91/x
  3. Step 3: Cross multiply
    15,887.21x = 21,926.98 × 8,815.91
  4. Step 4: Simplify right side
    15,887.21x = 193,306,282.25
  5. Step 5: Solve for x
    x = 193,306,282.25/15,887.21
  6. Step 6: Final answer
    x = 12,167.42

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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.