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Finding the Fourth Proportional to 280.63, 387.20 and 164.19

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Solution

The fourth proportional to 280.63, 387.20 and 164.19 is: 226.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.63 : 387.20 = 164.19 : x
  2. Step 2: Convert to fraction form
    280.63/387.20 = 164.19/x
  3. Step 3: Cross multiply
    280.63x = 387.20 × 164.19
  4. Step 4: Simplify right side
    280.63x = 63,574.37
  5. Step 5: Solve for x
    x = 63,574.37/280.63
  6. Step 6: Final answer
    x = 226.54

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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.