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Finding the Fourth Proportional to 213,891.26, 320,715.40 and 87,383.39

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Solution

The fourth proportional to 213,891.26, 320,715.40 and 87,383.39 is: 131,025.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,891.26 : 320,715.40 = 87,383.39 : x
  2. Step 2: Convert to fraction form
    213,891.26/320,715.40 = 87,383.39/x
  3. Step 3: Cross multiply
    213,891.26x = 320,715.40 × 87,383.39
  4. Step 4: Simplify right side
    213,891.26x = 28,025,198,440.29
  5. Step 5: Solve for x
    x = 28,025,198,440.29/213,891.26
  6. Step 6: Final answer
    x = 131,025.45

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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.