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Finding the Third Proportional to 129,009,380 and 278,541,640

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Solution

The third proportional to 129,009,380 and 278,541,640 is: 601,393,830.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,009,380 : 278,541,640 = 278,541,640 : x
  2. Step 2: Convert to fraction form
    129,009,380/278,541,640 = 278,541,640/x
  3. Step 3: Cross multiply
    129,009,380x = 278,541,640 × 278,541,640
  4. Step 4: Simplify right side
    129,009,380x = 77,585,445,213,889,600
  5. Step 5: Solve for x
    x = 77,585,445,213,889,600/129,009,380
  6. Step 6: Final answer
    x = 601,393,830.54

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.