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Finding the Third Proportional to 156 and 342

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Solution

The third proportional to 156 and 342 is: 749.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    156 : 342 = 342 : x
  2. Step 2: Convert to fraction form
    156/342 = 342/x
  3. Step 3: Cross multiply
    156x = 342 × 342
  4. Step 4: Simplify right side
    156x = 116,964
  5. Step 5: Solve for x
    x = 116,964/156
  6. Step 6: Final answer
    x = 749.77

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.