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Finding the Fourth Proportional to 280.95, 387.72 and 162.87

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Solution

The fourth proportional to 280.95, 387.72 and 162.87 is: 224.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.95 : 387.72 = 162.87 : x
  2. Step 2: Convert to fraction form
    280.95/387.72 = 162.87/x
  3. Step 3: Cross multiply
    280.95x = 387.72 × 162.87
  4. Step 4: Simplify right side
    280.95x = 63,147.96
  5. Step 5: Solve for x
    x = 63,147.96/280.95
  6. Step 6: Final answer
    x = 224.77

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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.