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Finding the Fourth Proportional to 405.69, 607.49 and 268.31

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Solution

The fourth proportional to 405.69, 607.49 and 268.31 is: 401.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.69 : 607.49 = 268.31 : x
  2. Step 2: Convert to fraction form
    405.69/607.49 = 268.31/x
  3. Step 3: Cross multiply
    405.69x = 607.49 × 268.31
  4. Step 4: Simplify right side
    405.69x = 162,995.64
  5. Step 5: Solve for x
    x = 162,995.64/405.69
  6. Step 6: Final answer
    x = 401.78

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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.