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Finding the Fourth Proportional to 1,325.12, 1,987 and 447.32

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Solution

The fourth proportional to 1,325.12, 1,987 and 447.32 is: 670.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.12 : 1,987 = 447.32 : x
  2. Step 2: Convert to fraction form
    1,325.12/1,987 = 447.32/x
  3. Step 3: Cross multiply
    1,325.12x = 1,987 × 447.32
  4. Step 4: Simplify right side
    1,325.12x = 888,824.84
  5. Step 5: Solve for x
    x = 888,824.84/1,325.12
  6. Step 6: Final answer
    x = 670.75

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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.