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Finding the Fourth Proportional to 197.55, 272.69 and 156.20

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Solution

The fourth proportional to 197.55, 272.69 and 156.20 is: 215.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.55 : 272.69 = 156.20 : x
  2. Step 2: Convert to fraction form
    197.55/272.69 = 156.20/x
  3. Step 3: Cross multiply
    197.55x = 272.69 × 156.20
  4. Step 4: Simplify right side
    197.55x = 42,592.03
  5. Step 5: Solve for x
    x = 42,592.03/197.55
  6. Step 6: Final answer
    x = 215.60

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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.