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Finding the Fourth Proportional to 159,906.40, 240,013.20 and 81,109.60

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Solution

The fourth proportional to 159,906.40, 240,013.20 and 81,109.60 is: 121,742.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,906.40 : 240,013.20 = 81,109.60 : x
  2. Step 2: Convert to fraction form
    159,906.40/240,013.20 = 81,109.60/x
  3. Step 3: Cross multiply
    159,906.40x = 240,013.20 × 81,109.60
  4. Step 4: Simplify right side
    159,906.40x = 19,467,374,646.72
  5. Step 5: Solve for x
    x = 19,467,374,646.72/159,906.40
  6. Step 6: Final answer
    x = 121,742.31

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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.