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Finding the Fourth Proportional to 936.62, 1,405.07 and 388.92

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Solution

The fourth proportional to 936.62, 1,405.07 and 388.92 is: 583.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.62 : 1,405.07 = 388.92 : x
  2. Step 2: Convert to fraction form
    936.62/1,405.07 = 388.92/x
  3. Step 3: Cross multiply
    936.62x = 1,405.07 × 388.92
  4. Step 4: Simplify right side
    936.62x = 546,457.88
  5. Step 5: Solve for x
    x = 546,457.88/936.62
  6. Step 6: Final answer
    x = 583.44

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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.