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Finding the Fourth Proportional to 15,838.67, 21,857.39 and 8,765.09

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Solution

The fourth proportional to 15,838.67, 21,857.39 and 8,765.09 is: 12,095.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,838.67 : 21,857.39 = 8,765.09 : x
  2. Step 2: Convert to fraction form
    15,838.67/21,857.39 = 8,765.09/x
  3. Step 3: Cross multiply
    15,838.67x = 21,857.39 × 8,765.09
  4. Step 4: Simplify right side
    15,838.67x = 191,582,124.49
  5. Step 5: Solve for x
    x = 191,582,124.49/15,838.67
  6. Step 6: Final answer
    x = 12,095.84

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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.