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Finding the Fourth Proportional to 280.67, 421.40 and 182.86

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Solution

The fourth proportional to 280.67, 421.40 and 182.86 is: 274.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.67 : 421.40 = 182.86 : x
  2. Step 2: Convert to fraction form
    280.67/421.40 = 182.86/x
  3. Step 3: Cross multiply
    280.67x = 421.40 × 182.86
  4. Step 4: Simplify right side
    280.67x = 77,056.61
  5. Step 5: Solve for x
    x = 77,056.61/280.67
  6. Step 6: Final answer
    x = 274.55

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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.