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Finding the Fourth Proportional to 1,039.40, 1,559.07 and 381.43

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Solution

The fourth proportional to 1,039.40, 1,559.07 and 381.43 is: 572.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.40 : 1,559.07 = 381.43 : x
  2. Step 2: Convert to fraction form
    1,039.40/1,559.07 = 381.43/x
  3. Step 3: Cross multiply
    1,039.40x = 1,559.07 × 381.43
  4. Step 4: Simplify right side
    1,039.40x = 594,672.17
  5. Step 5: Solve for x
    x = 594,672.17/1,039.40
  6. Step 6: Final answer
    x = 572.13

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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.