Home / 28,138.68-38,826.81-15,561

Finding the Fourth Proportional to 28,138.68, 38,826.81 and 15,561

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Solution

The fourth proportional to 28,138.68, 38,826.81 and 15,561 is: 21,471.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.68 : 38,826.81 = 15,561 : x
  2. Step 2: Convert to fraction form
    28,138.68/38,826.81 = 15,561/x
  3. Step 3: Cross multiply
    28,138.68x = 38,826.81 × 15,561
  4. Step 4: Simplify right side
    28,138.68x = 604,183,990.41
  5. Step 5: Solve for x
    x = 604,183,990.41/28,138.68
  6. Step 6: Final answer
    x = 21,471.65

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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.