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Finding the Fourth Proportional to 156.11, 215.43 and 86.17

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Solution

The fourth proportional to 156.11, 215.43 and 86.17 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.11 : 215.43 = 86.17 : x
  2. Step 2: Convert to fraction form
    156.11/215.43 = 86.17/x
  3. Step 3: Cross multiply
    156.11x = 215.43 × 86.17
  4. Step 4: Simplify right side
    156.11x = 18,563.21
  5. Step 5: Solve for x
    x = 18,563.21/156.11
  6. Step 6: Final answer
    x = 118.91

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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.