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Finding the Fourth Proportional to 961.52, 1,440.41 and 755.15

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Solution

The fourth proportional to 961.52, 1,440.41 and 755.15 is: 1,131.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.52 : 1,440.41 = 755.15 : x
  2. Step 2: Convert to fraction form
    961.52/1,440.41 = 755.15/x
  3. Step 3: Cross multiply
    961.52x = 1,440.41 × 755.15
  4. Step 4: Simplify right side
    961.52x = 1,087,714.63
  5. Step 5: Solve for x
    x = 1,087,714.63/961.52
  6. Step 6: Final answer
    x = 1,131.25

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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.