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Finding the Third Proportional to 129,276 and 198,639

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Solution

The third proportional to 129,276 and 198,639 is: 305,218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,276 : 198,639 = 198,639 : x
  2. Step 2: Convert to fraction form
    129,276/198,639 = 198,639/x
  3. Step 3: Cross multiply
    129,276x = 198,639 × 198,639
  4. Step 4: Simplify right side
    129,276x = 39,457,452,321
  5. Step 5: Solve for x
    x = 39,457,452,321/129,276
  6. Step 6: Final answer
    x = 305,218.70

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.