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Finding the Fourth Proportional to 280.19, 386.69 and 162.21

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Solution

The fourth proportional to 280.19, 386.69 and 162.21 is: 223.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.19 : 386.69 = 162.21 : x
  2. Step 2: Convert to fraction form
    280.19/386.69 = 162.21/x
  3. Step 3: Cross multiply
    280.19x = 386.69 × 162.21
  4. Step 4: Simplify right side
    280.19x = 62,722.65
  5. Step 5: Solve for x
    x = 62,722.65/280.19
  6. Step 6: Final answer
    x = 223.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.