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Finding the Fourth Proportional to 936.75, 1,405.13 and 252.75

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Solution

The fourth proportional to 936.75, 1,405.13 and 252.75 is: 379.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.75 : 1,405.13 = 252.75 : x
  2. Step 2: Convert to fraction form
    936.75/1,405.13 = 252.75/x
  3. Step 3: Cross multiply
    936.75x = 1,405.13 × 252.75
  4. Step 4: Simplify right side
    936.75x = 355,145.34
  5. Step 5: Solve for x
    x = 355,145.34/936.75
  6. Step 6: Final answer
    x = 379.13

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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.