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Finding the Fourth Proportional to 1,679.38, 2,519 and 509.34

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Solution

The fourth proportional to 1,679.38, 2,519 and 509.34 is: 763.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.38 : 2,519 = 509.34 : x
  2. Step 2: Convert to fraction form
    1,679.38/2,519 = 509.34/x
  3. Step 3: Cross multiply
    1,679.38x = 2,519 × 509.34
  4. Step 4: Simplify right side
    1,679.38x = 1,283,027.46
  5. Step 5: Solve for x
    x = 1,283,027.46/1,679.38
  6. Step 6: Final answer
    x = 763.99

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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.