Home / 21,288.05-29,378.42-11,856.61

Finding the Fourth Proportional to 21,288.05, 29,378.42 and 11,856.61

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Solution

The fourth proportional to 21,288.05, 29,378.42 and 11,856.61 is: 16,362.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.05 : 29,378.42 = 11,856.61 : x
  2. Step 2: Convert to fraction form
    21,288.05/29,378.42 = 11,856.61/x
  3. Step 3: Cross multiply
    21,288.05x = 29,378.42 × 11,856.61
  4. Step 4: Simplify right side
    21,288.05x = 348,328,445.80
  5. Step 5: Solve for x
    x = 348,328,445.80/21,288.05
  6. Step 6: Final answer
    x = 16,362.63

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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.