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Finding the Fourth Proportional to 156.11, 215.34 and 97.07

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Solution

The fourth proportional to 156.11, 215.34 and 97.07 is: 133.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.11 : 215.34 = 97.07 : x
  2. Step 2: Convert to fraction form
    156.11/215.34 = 97.07/x
  3. Step 3: Cross multiply
    156.11x = 215.34 × 97.07
  4. Step 4: Simplify right side
    156.11x = 20,903.05
  5. Step 5: Solve for x
    x = 20,903.05/156.11
  6. Step 6: Final answer
    x = 133.90

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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.