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Finding the Third Proportional to 66,361,790 and 138,020,980

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Solution

The third proportional to 66,361,790 and 138,020,980 is: 287,059,630.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,361,790 : 138,020,980 = 138,020,980 : x
  2. Step 2: Convert to fraction form
    66,361,790/138,020,980 = 138,020,980/x
  3. Step 3: Cross multiply
    66,361,790x = 138,020,980 × 138,020,980
  4. Step 4: Simplify right side
    66,361,790x = 19,049,790,920,160,400
  5. Step 5: Solve for x
    x = 19,049,790,920,160,400/66,361,790
  6. Step 6: Final answer
    x = 287,059,630.55

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.