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Finding the Fourth Proportional to 280.18, 419.77 and 187.69

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Solution

The fourth proportional to 280.18, 419.77 and 187.69 is: 281.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.18 : 419.77 = 187.69 : x
  2. Step 2: Convert to fraction form
    280.18/419.77 = 187.69/x
  3. Step 3: Cross multiply
    280.18x = 419.77 × 187.69
  4. Step 4: Simplify right side
    280.18x = 78,784.53
  5. Step 5: Solve for x
    x = 78,784.53/280.18
  6. Step 6: Final answer
    x = 281.19

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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.