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Finding the Fourth Proportional to 197.68, 272.92 and 156.40

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Solution

The fourth proportional to 197.68, 272.92 and 156.40 is: 215.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.68 : 272.92 = 156.40 : x
  2. Step 2: Convert to fraction form
    197.68/272.92 = 156.40/x
  3. Step 3: Cross multiply
    197.68x = 272.92 × 156.40
  4. Step 4: Simplify right side
    197.68x = 42,684.69
  5. Step 5: Solve for x
    x = 42,684.69/197.68
  6. Step 6: Final answer
    x = 215.93

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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.