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Finding the Fourth Proportional to 936.72, 1,405.35 and 287.55

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Solution

The fourth proportional to 936.72, 1,405.35 and 287.55 is: 431.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.72 : 1,405.35 = 287.55 : x
  2. Step 2: Convert to fraction form
    936.72/1,405.35 = 287.55/x
  3. Step 3: Cross multiply
    936.72x = 1,405.35 × 287.55
  4. Step 4: Simplify right side
    936.72x = 404,108.39
  5. Step 5: Solve for x
    x = 404,108.39/936.72
  6. Step 6: Final answer
    x = 431.41

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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.