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Finding the Fourth Proportional to 936.90, 1,405.73 and 389.43

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Solution

The fourth proportional to 936.90, 1,405.73 and 389.43 is: 584.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,405.73 = 389.43 : x
  2. Step 2: Convert to fraction form
    936.90/1,405.73 = 389.43/x
  3. Step 3: Cross multiply
    936.90x = 1,405.73 × 389.43
  4. Step 4: Simplify right side
    936.90x = 547,434.41
  5. Step 5: Solve for x
    x = 547,434.41/936.90
  6. Step 6: Final answer
    x = 584.30

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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.