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Finding the Fourth Proportional to 15,808.50, 21,815.72 and 8,734.92

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Solution

The fourth proportional to 15,808.50, 21,815.72 and 8,734.92 is: 12,054.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,808.50 : 21,815.72 = 8,734.92 : x
  2. Step 2: Convert to fraction form
    15,808.50/21,815.72 = 8,734.92/x
  3. Step 3: Cross multiply
    15,808.50x = 21,815.72 × 8,734.92
  4. Step 4: Simplify right side
    15,808.50x = 190,558,568.94
  5. Step 5: Solve for x
    x = 190,558,568.94/15,808.50
  6. Step 6: Final answer
    x = 12,054.18

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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.