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Finding the Fourth Proportional to 197.72, 272.90 and 156.31

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Solution

The fourth proportional to 197.72, 272.90 and 156.31 is: 215.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.72 : 272.90 = 156.31 : x
  2. Step 2: Convert to fraction form
    197.72/272.90 = 156.31/x
  3. Step 3: Cross multiply
    197.72x = 272.90 × 156.31
  4. Step 4: Simplify right side
    197.72x = 42,657.00
  5. Step 5: Solve for x
    x = 42,657.00/197.72
  6. Step 6: Final answer
    x = 215.74

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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.