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Finding the Fourth Proportional to 1,519.91, 2,279.87 and 424.28

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Solution

The fourth proportional to 1,519.91, 2,279.87 and 424.28 is: 636.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,519.91 : 2,279.87 = 424.28 : x
  2. Step 2: Convert to fraction form
    1,519.91/2,279.87 = 424.28/x
  3. Step 3: Cross multiply
    1,519.91x = 2,279.87 × 424.28
  4. Step 4: Simplify right side
    1,519.91x = 967,289.72
  5. Step 5: Solve for x
    x = 967,289.72/1,519.91
  6. Step 6: Final answer
    x = 636.41

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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.