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Finding the Fourth Proportional to 15,786.68, 21,785.94 and 8,713.08

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Solution

The fourth proportional to 15,786.68, 21,785.94 and 8,713.08 is: 12,024.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.68 : 21,785.94 = 8,713.08 : x
  2. Step 2: Convert to fraction form
    15,786.68/21,785.94 = 8,713.08/x
  3. Step 3: Cross multiply
    15,786.68x = 21,785.94 × 8,713.08
  4. Step 4: Simplify right side
    15,786.68x = 189,822,638.10
  5. Step 5: Solve for x
    x = 189,822,638.10/15,786.68
  6. Step 6: Final answer
    x = 12,024.23

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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.