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Finding the Fourth Proportional to 1,325.43, 1,987.92 and 351.63

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Solution

The fourth proportional to 1,325.43, 1,987.92 and 351.63 is: 527.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.43 : 1,987.92 = 351.63 : x
  2. Step 2: Convert to fraction form
    1,325.43/1,987.92 = 351.63/x
  3. Step 3: Cross multiply
    1,325.43x = 1,987.92 × 351.63
  4. Step 4: Simplify right side
    1,325.43x = 699,012.31
  5. Step 5: Solve for x
    x = 699,012.31/1,325.43
  6. Step 6: Final answer
    x = 527.39

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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.