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Finding the Fourth Proportional to 936.91, 1,405.37 and 388.95

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Solution

The fourth proportional to 936.91, 1,405.37 and 388.95 is: 583.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.91 : 1,405.37 = 388.95 : x
  2. Step 2: Convert to fraction form
    936.91/1,405.37 = 388.95/x
  3. Step 3: Cross multiply
    936.91x = 1,405.37 × 388.95
  4. Step 4: Simplify right side
    936.91x = 546,618.66
  5. Step 5: Solve for x
    x = 546,618.66/936.91
  6. Step 6: Final answer
    x = 583.43

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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.