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Finding the Fourth Proportional to 759.36, 1,139.20 and 272.32

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Solution

The fourth proportional to 759.36, 1,139.20 and 272.32 is: 408.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.36 : 1,139.20 = 272.32 : x
  2. Step 2: Convert to fraction form
    759.36/1,139.20 = 272.32/x
  3. Step 3: Cross multiply
    759.36x = 1,139.20 × 272.32
  4. Step 4: Simplify right side
    759.36x = 310,226.94
  5. Step 5: Solve for x
    x = 310,226.94/759.36
  6. Step 6: Final answer
    x = 408.54

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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.