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Finding the Fourth Proportional to 121,511,996.60, 167,686,978.73 and 65,757,403.06

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Solution

The fourth proportional to 121,511,996.60, 167,686,978.73 and 65,757,403.06 is: 90,745,445.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,511,996.60 : 167,686,978.73 = 65,757,403.06 : x
  2. Step 2: Convert to fraction form
    121,511,996.60/167,686,978.73 = 65,757,403.06/x
  3. Step 3: Cross multiply
    121,511,996.60x = 167,686,978.73 × 65,757,403.06
  4. Step 4: Simplify right side
    121,511,996.60x = 11,026,660,247,514,252
  5. Step 5: Solve for x
    x = 11,026,660,247,514,252/121,511,996.60
  6. Step 6: Final answer
    x = 90,745,445.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.