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Finding the Fourth Proportional to 1,012.90, 1,518.22 and 427.73

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Solution

The fourth proportional to 1,012.90, 1,518.22 and 427.73 is: 641.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.90 : 1,518.22 = 427.73 : x
  2. Step 2: Convert to fraction form
    1,012.90/1,518.22 = 427.73/x
  3. Step 3: Cross multiply
    1,012.90x = 1,518.22 × 427.73
  4. Step 4: Simplify right side
    1,012.90x = 649,388.24
  5. Step 5: Solve for x
    x = 649,388.24/1,012.90
  6. Step 6: Final answer
    x = 641.12

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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.