Home / 15,712.70-21,682.97-8,639.06

Finding the Fourth Proportional to 15,712.70, 21,682.97 and 8,639.06

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Solution

The fourth proportional to 15,712.70, 21,682.97 and 8,639.06 is: 11,921.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,712.70 : 21,682.97 = 8,639.06 : x
  2. Step 2: Convert to fraction form
    15,712.70/21,682.97 = 8,639.06/x
  3. Step 3: Cross multiply
    15,712.70x = 21,682.97 × 8,639.06
  4. Step 4: Simplify right side
    15,712.70x = 187,320,435.61
  5. Step 5: Solve for x
    x = 187,320,435.61/15,712.70
  6. Step 6: Final answer
    x = 11,921.59

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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.