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Finding the Third Proportional to 129,688 and 305,340

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Solution

The third proportional to 129,688 and 305,340 is: 718,898.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,688 : 305,340 = 305,340 : x
  2. Step 2: Convert to fraction form
    129,688/305,340 = 305,340/x
  3. Step 3: Cross multiply
    129,688x = 305,340 × 305,340
  4. Step 4: Simplify right side
    129,688x = 93,232,515,600
  5. Step 5: Solve for x
    x = 93,232,515,600/129,688
  6. Step 6: Final answer
    x = 718,898.55

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.