Home / 28,208.40-42,343.38-20,789.88

Finding the Fourth Proportional to 28,208.40, 42,343.38 and 20,789.88

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Solution

The fourth proportional to 28,208.40, 42,343.38 and 20,789.88 is: 31,207.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,208.40 : 42,343.38 = 20,789.88 : x
  2. Step 2: Convert to fraction form
    28,208.40/42,343.38 = 20,789.88/x
  3. Step 3: Cross multiply
    28,208.40x = 42,343.38 × 20,789.88
  4. Step 4: Simplify right side
    28,208.40x = 880,313,788.99
  5. Step 5: Solve for x
    x = 880,313,788.99/28,208.40
  6. Step 6: Final answer
    x = 31,207.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.