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Finding the Fourth Proportional to 1,269.70, 1,905.51 and 539.79

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Solution

The fourth proportional to 1,269.70, 1,905.51 and 539.79 is: 810.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.70 : 1,905.51 = 539.79 : x
  2. Step 2: Convert to fraction form
    1,269.70/1,905.51 = 539.79/x
  3. Step 3: Cross multiply
    1,269.70x = 1,905.51 × 539.79
  4. Step 4: Simplify right side
    1,269.70x = 1,028,575.24
  5. Step 5: Solve for x
    x = 1,028,575.24/1,269.70
  6. Step 6: Final answer
    x = 810.09

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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.