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Finding the Fourth Proportional to 1,012.47, 1,519.08 and 427.62

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Solution

The fourth proportional to 1,012.47, 1,519.08 and 427.62 is: 641.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.47 : 1,519.08 = 427.62 : x
  2. Step 2: Convert to fraction form
    1,012.47/1,519.08 = 427.62/x
  3. Step 3: Cross multiply
    1,012.47x = 1,519.08 × 427.62
  4. Step 4: Simplify right side
    1,012.47x = 649,586.85
  5. Step 5: Solve for x
    x = 649,586.85/1,012.47
  6. Step 6: Final answer
    x = 641.59

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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.