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Finding the Fourth Proportional to 280.05, 386.05 and 197.03

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Solution

The fourth proportional to 280.05, 386.05 and 197.03 is: 271.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.05 : 386.05 = 197.03 : x
  2. Step 2: Convert to fraction form
    280.05/386.05 = 197.03/x
  3. Step 3: Cross multiply
    280.05x = 386.05 × 197.03
  4. Step 4: Simplify right side
    280.05x = 76,060.52
  5. Step 5: Solve for x
    x = 76,060.52/280.05
  6. Step 6: Final answer
    x = 271.60

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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.