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Finding the Fourth Proportional to 936.79, 1,405.21 and 449.31

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Solution

The fourth proportional to 936.79, 1,405.21 and 449.31 is: 673.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.79 : 1,405.21 = 449.31 : x
  2. Step 2: Convert to fraction form
    936.79/1,405.21 = 449.31/x
  3. Step 3: Cross multiply
    936.79x = 1,405.21 × 449.31
  4. Step 4: Simplify right side
    936.79x = 631,374.91
  5. Step 5: Solve for x
    x = 631,374.91/936.79
  6. Step 6: Final answer
    x = 673.98

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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.