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Finding the Fourth Proportional to 15,840.87, 21,859.79 and 8,767.14

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Solution

The fourth proportional to 15,840.87, 21,859.79 and 8,767.14 is: 12,098.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,840.87 : 21,859.79 = 8,767.14 : x
  2. Step 2: Convert to fraction form
    15,840.87/21,859.79 = 8,767.14/x
  3. Step 3: Cross multiply
    15,840.87x = 21,859.79 × 8,767.14
  4. Step 4: Simplify right side
    15,840.87x = 191,647,795.46
  5. Step 5: Solve for x
    x = 191,647,795.46/15,840.87
  6. Step 6: Final answer
    x = 12,098.31

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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.