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Finding the Fourth Proportional to 405.65, 608.79 and 162.20

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Solution

The fourth proportional to 405.65, 608.79 and 162.20 is: 243.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.65 : 608.79 = 162.20 : x
  2. Step 2: Convert to fraction form
    405.65/608.79 = 162.20/x
  3. Step 3: Cross multiply
    405.65x = 608.79 × 162.20
  4. Step 4: Simplify right side
    405.65x = 98,745.74
  5. Step 5: Solve for x
    x = 98,745.74/405.65
  6. Step 6: Final answer
    x = 243.43

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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.