Home / 1,008.20-1,511.21-423.52

Finding the Fourth Proportional to 1,008.20, 1,511.21 and 423.52

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Solution

The fourth proportional to 1,008.20, 1,511.21 and 423.52 is: 634.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.20 : 1,511.21 = 423.52 : x
  2. Step 2: Convert to fraction form
    1,008.20/1,511.21 = 423.52/x
  3. Step 3: Cross multiply
    1,008.20x = 1,511.21 × 423.52
  4. Step 4: Simplify right side
    1,008.20x = 640,027.66
  5. Step 5: Solve for x
    x = 640,027.66/1,008.20
  6. Step 6: Final answer
    x = 634.82

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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.