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Finding the Fourth Proportional to 1,269.09, 1,903.39 and 391.36

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Solution

The fourth proportional to 1,269.09, 1,903.39 and 391.36 is: 586.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.09 : 1,903.39 = 391.36 : x
  2. Step 2: Convert to fraction form
    1,269.09/1,903.39 = 391.36/x
  3. Step 3: Cross multiply
    1,269.09x = 1,903.39 × 391.36
  4. Step 4: Simplify right side
    1,269.09x = 744,910.71
  5. Step 5: Solve for x
    x = 744,910.71/1,269.09
  6. Step 6: Final answer
    x = 586.96

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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.