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Finding the Fourth Proportional to 197.47, 272.64 and 123.90

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Solution

The fourth proportional to 197.47, 272.64 and 123.90 is: 171.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.47 : 272.64 = 123.90 : x
  2. Step 2: Convert to fraction form
    197.47/272.64 = 123.90/x
  3. Step 3: Cross multiply
    197.47x = 272.64 × 123.90
  4. Step 4: Simplify right side
    197.47x = 33,780.10
  5. Step 5: Solve for x
    x = 33,780.10/197.47
  6. Step 6: Final answer
    x = 171.06

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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.