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Finding the Fourth Proportional to 280.14, 420.27 and 87.75

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Solution

The fourth proportional to 280.14, 420.27 and 87.75 is: 131.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.14 : 420.27 = 87.75 : x
  2. Step 2: Convert to fraction form
    280.14/420.27 = 87.75/x
  3. Step 3: Cross multiply
    280.14x = 420.27 × 87.75
  4. Step 4: Simplify right side
    280.14x = 36,878.69
  5. Step 5: Solve for x
    x = 36,878.69/280.14
  6. Step 6: Final answer
    x = 131.64

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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.