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Finding the Fourth Proportional to 1,259.41, 1,889.20 and 381.87

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Solution

The fourth proportional to 1,259.41, 1,889.20 and 381.87 is: 572.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.41 : 1,889.20 = 381.87 : x
  2. Step 2: Convert to fraction form
    1,259.41/1,889.20 = 381.87/x
  3. Step 3: Cross multiply
    1,259.41x = 1,889.20 × 381.87
  4. Step 4: Simplify right side
    1,259.41x = 721,428.80
  5. Step 5: Solve for x
    x = 721,428.80/1,259.41
  6. Step 6: Final answer
    x = 572.83

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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.