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Finding the Fourth Proportional to 1,279.84, 1,919.96 and 539.68

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Solution

The fourth proportional to 1,279.84, 1,919.96 and 539.68 is: 809.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.84 : 1,919.96 = 539.68 : x
  2. Step 2: Convert to fraction form
    1,279.84/1,919.96 = 539.68/x
  3. Step 3: Cross multiply
    1,279.84x = 1,919.96 × 539.68
  4. Step 4: Simplify right side
    1,279.84x = 1,036,164.01
  5. Step 5: Solve for x
    x = 1,036,164.01/1,279.84
  6. Step 6: Final answer
    x = 809.60

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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.