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Finding the Fourth Proportional to 138,999.80, 208,420.70 and 54,714.27

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Solution

The fourth proportional to 138,999.80, 208,420.70 and 54,714.27 is: 82,040.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,999.80 : 208,420.70 = 54,714.27 : x
  2. Step 2: Convert to fraction form
    138,999.80/208,420.70 = 54,714.27/x
  3. Step 3: Cross multiply
    138,999.80x = 208,420.70 × 54,714.27
  4. Step 4: Simplify right side
    138,999.80x = 11,403,586,179.82
  5. Step 5: Solve for x
    x = 11,403,586,179.82/138,999.80
  6. Step 6: Final answer
    x = 82,040.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.