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Finding the Fourth Proportional to 156.29, 216 and 138.68

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Solution

The fourth proportional to 156.29, 216 and 138.68 is: 191.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.29 : 216 = 138.68 : x
  2. Step 2: Convert to fraction form
    156.29/216 = 138.68/x
  3. Step 3: Cross multiply
    156.29x = 216 × 138.68
  4. Step 4: Simplify right side
    156.29x = 29,953.80
  5. Step 5: Solve for x
    x = 29,953.80/156.29
  6. Step 6: Final answer
    x = 191.66

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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.