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Finding the Fourth Proportional to 280.50, 387.21 and 214.12

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Solution

The fourth proportional to 280.50, 387.21 and 214.12 is: 295.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.50 : 387.21 = 214.12 : x
  2. Step 2: Convert to fraction form
    280.50/387.21 = 214.12/x
  3. Step 3: Cross multiply
    280.50x = 387.21 × 214.12
  4. Step 4: Simplify right side
    280.50x = 82,909.41
  5. Step 5: Solve for x
    x = 82,909.41/280.50
  6. Step 6: Final answer
    x = 295.58

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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.