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Finding the Fourth Proportional to 1,325.75, 1,988.63 and 401.31

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Solution

The fourth proportional to 1,325.75, 1,988.63 and 401.31 is: 601.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.75 : 1,988.63 = 401.31 : x
  2. Step 2: Convert to fraction form
    1,325.75/1,988.63 = 401.31/x
  3. Step 3: Cross multiply
    1,325.75x = 1,988.63 × 401.31
  4. Step 4: Simplify right side
    1,325.75x = 798,057.11
  5. Step 5: Solve for x
    x = 798,057.11/1,325.75
  6. Step 6: Final answer
    x = 601.97

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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.