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Finding the Fourth Proportional to 280.08, 419.50 and 218.72

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Solution

The fourth proportional to 280.08, 419.50 and 218.72 is: 327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.08 : 419.50 = 218.72 : x
  2. Step 2: Convert to fraction form
    280.08/419.50 = 218.72/x
  3. Step 3: Cross multiply
    280.08x = 419.50 × 218.72
  4. Step 4: Simplify right side
    280.08x = 91,753.04
  5. Step 5: Solve for x
    x = 91,753.04/280.08
  6. Step 6: Final answer
    x = 327.60

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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.