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Finding the Fourth Proportional to 1,269.91, 1,905.15 and 539.51

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Solution

The fourth proportional to 1,269.91, 1,905.15 and 539.51 is: 809.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.91 : 1,905.15 = 539.51 : x
  2. Step 2: Convert to fraction form
    1,269.91/1,905.15 = 539.51/x
  3. Step 3: Cross multiply
    1,269.91x = 1,905.15 × 539.51
  4. Step 4: Simplify right side
    1,269.91x = 1,027,847.48
  5. Step 5: Solve for x
    x = 1,027,847.48/1,269.91
  6. Step 6: Final answer
    x = 809.39

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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.