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Finding the Fourth Proportional to 1,325.21, 1,987.67 and 351.39

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Solution

The fourth proportional to 1,325.21, 1,987.67 and 351.39 is: 527.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.21 : 1,987.67 = 351.39 : x
  2. Step 2: Convert to fraction form
    1,325.21/1,987.67 = 351.39/x
  3. Step 3: Cross multiply
    1,325.21x = 1,987.67 × 351.39
  4. Step 4: Simplify right side
    1,325.21x = 698,445.60
  5. Step 5: Solve for x
    x = 698,445.60/1,325.21
  6. Step 6: Final answer
    x = 527.05

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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.