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Finding the Fourth Proportional to 1,325.38, 1,987.40 and 447.52

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Solution

The fourth proportional to 1,325.38, 1,987.40 and 447.52 is: 671.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.38 : 1,987.40 = 447.52 : x
  2. Step 2: Convert to fraction form
    1,325.38/1,987.40 = 447.52/x
  3. Step 3: Cross multiply
    1,325.38x = 1,987.40 × 447.52
  4. Step 4: Simplify right side
    1,325.38x = 889,401.25
  5. Step 5: Solve for x
    x = 889,401.25/1,325.38
  6. Step 6: Final answer
    x = 671.05

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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.