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Finding the Fourth Proportional to 156.21, 215.55 and 86.27

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Solution

The fourth proportional to 156.21, 215.55 and 86.27 is: 119.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.21 : 215.55 = 86.27 : x
  2. Step 2: Convert to fraction form
    156.21/215.55 = 86.27/x
  3. Step 3: Cross multiply
    156.21x = 215.55 × 86.27
  4. Step 4: Simplify right side
    156.21x = 18,594.74
  5. Step 5: Solve for x
    x = 18,594.74/156.21
  6. Step 6: Final answer
    x = 119.04

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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.