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Finding the Fourth Proportional to 280.03, 386.55 and 186.86

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Solution

The fourth proportional to 280.03, 386.55 and 186.86 is: 257.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.03 : 386.55 = 186.86 : x
  2. Step 2: Convert to fraction form
    280.03/386.55 = 186.86/x
  3. Step 3: Cross multiply
    280.03x = 386.55 × 186.86
  4. Step 4: Simplify right side
    280.03x = 72,230.73
  5. Step 5: Solve for x
    x = 72,230.73/280.03
  6. Step 6: Final answer
    x = 257.94

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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.