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Finding the Fourth Proportional to 1,101.20, 1,651.27 and 639.12

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Solution

The fourth proportional to 1,101.20, 1,651.27 and 639.12 is: 958.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.20 : 1,651.27 = 639.12 : x
  2. Step 2: Convert to fraction form
    1,101.20/1,651.27 = 639.12/x
  3. Step 3: Cross multiply
    1,101.20x = 1,651.27 × 639.12
  4. Step 4: Simplify right side
    1,101.20x = 1,055,351.54
  5. Step 5: Solve for x
    x = 1,055,351.54/1,101.20
  6. Step 6: Final answer
    x = 958.37

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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.