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Finding the Fourth Proportional to 15,859.10, 21,886.89 and 8,786.18

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Solution

The fourth proportional to 15,859.10, 21,886.89 and 8,786.18 is: 12,125.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.10 : 21,886.89 = 8,786.18 : x
  2. Step 2: Convert to fraction form
    15,859.10/21,886.89 = 8,786.18/x
  3. Step 3: Cross multiply
    15,859.10x = 21,886.89 × 8,786.18
  4. Step 4: Simplify right side
    15,859.10x = 192,302,155.18
  5. Step 5: Solve for x
    x = 192,302,155.18/15,859.10
  6. Step 6: Final answer
    x = 12,125.67

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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.