Home / 28,921.80-39,900.78-18,162.09

Finding the Fourth Proportional to 28,921.80, 39,900.78 and 18,162.09

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Solution

The fourth proportional to 28,921.80, 39,900.78 and 18,162.09 is: 25,056.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,921.80 : 39,900.78 = 18,162.09 : x
  2. Step 2: Convert to fraction form
    28,921.80/39,900.78 = 18,162.09/x
  3. Step 3: Cross multiply
    28,921.80x = 39,900.78 × 18,162.09
  4. Step 4: Simplify right side
    28,921.80x = 724,681,557.43
  5. Step 5: Solve for x
    x = 724,681,557.43/28,921.80
  6. Step 6: Final answer
    x = 25,056.59

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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.