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Finding the Fourth Proportional to 1,679.12, 2,518.68 and 509.12

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Solution

The fourth proportional to 1,679.12, 2,518.68 and 509.12 is: 763.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.12 : 2,518.68 = 509.12 : x
  2. Step 2: Convert to fraction form
    1,679.12/2,518.68 = 509.12/x
  3. Step 3: Cross multiply
    1,679.12x = 2,518.68 × 509.12
  4. Step 4: Simplify right side
    1,679.12x = 1,282,310.36
  5. Step 5: Solve for x
    x = 1,282,310.36/1,679.12
  6. Step 6: Final answer
    x = 763.68

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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.