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Finding the Fourth Proportional to 138,999.40, 208,460.70 and 55,901.80

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Solution

The fourth proportional to 138,999.40, 208,460.70 and 55,901.80 is: 83,837.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,999.40 : 208,460.70 = 55,901.80 : x
  2. Step 2: Convert to fraction form
    138,999.40/208,460.70 = 55,901.80/x
  3. Step 3: Cross multiply
    138,999.40x = 208,460.70 × 55,901.80
  4. Step 4: Simplify right side
    138,999.40x = 11,653,328,359.26
  5. Step 5: Solve for x
    x = 11,653,328,359.26/138,999.40
  6. Step 6: Final answer
    x = 83,837.26

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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.