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Finding the Fourth Proportional to 15,889.79, 21,928.64 and 8,815.79

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Solution

The fourth proportional to 15,889.79, 21,928.64 and 8,815.79 is: 12,166.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,889.79 : 21,928.64 = 8,815.79 : x
  2. Step 2: Convert to fraction form
    15,889.79/21,928.64 = 8,815.79/x
  3. Step 3: Cross multiply
    15,889.79x = 21,928.64 × 8,815.79
  4. Step 4: Simplify right side
    15,889.79x = 193,318,131.50
  5. Step 5: Solve for x
    x = 193,318,131.50/15,889.79
  6. Step 6: Final answer
    x = 12,166.19

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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.