Home / 1,012.20-1,517.30-427.36

Finding the Fourth Proportional to 1,012.20, 1,517.30 and 427.36

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Solution

The fourth proportional to 1,012.20, 1,517.30 and 427.36 is: 640.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.20 : 1,517.30 = 427.36 : x
  2. Step 2: Convert to fraction form
    1,012.20/1,517.30 = 427.36/x
  3. Step 3: Cross multiply
    1,012.20x = 1,517.30 × 427.36
  4. Step 4: Simplify right side
    1,012.20x = 648,431.19
  5. Step 5: Solve for x
    x = 648,431.19/1,012.20
  6. Step 6: Final answer
    x = 640.62

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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.