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Finding the Fourth Proportional to 280.45, 387.05 and 164

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Solution

The fourth proportional to 280.45, 387.05 and 164 is: 226.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.45 : 387.05 = 164 : x
  2. Step 2: Convert to fraction form
    280.45/387.05 = 164/x
  3. Step 3: Cross multiply
    280.45x = 387.05 × 164
  4. Step 4: Simplify right side
    280.45x = 63,475.38
  5. Step 5: Solve for x
    x = 63,475.38/280.45
  6. Step 6: Final answer
    x = 226.34

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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.