Home / 1,288.20-1,932.67-423.12

Finding the Fourth Proportional to 1,288.20, 1,932.67 and 423.12

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Solution

The fourth proportional to 1,288.20, 1,932.67 and 423.12 is: 634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.20 : 1,932.67 = 423.12 : x
  2. Step 2: Convert to fraction form
    1,288.20/1,932.67 = 423.12/x
  3. Step 3: Cross multiply
    1,288.20x = 1,932.67 × 423.12
  4. Step 4: Simplify right side
    1,288.20x = 817,754.05
  5. Step 5: Solve for x
    x = 817,754.05/1,288.20
  6. Step 6: Final answer
    x = 634.80

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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.