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Finding the Fourth Proportional to 159,938.89, 239,765.77 and 81,012.49

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Solution

The fourth proportional to 159,938.89, 239,765.77 and 81,012.49 is: 121,446.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,938.89 : 239,765.77 = 81,012.49 : x
  2. Step 2: Convert to fraction form
    159,938.89/239,765.77 = 81,012.49/x
  3. Step 3: Cross multiply
    159,938.89x = 239,765.77 × 81,012.49
  4. Step 4: Simplify right side
    159,938.89x = 19,424,022,044.47
  5. Step 5: Solve for x
    x = 19,424,022,044.47/159,938.89
  6. Step 6: Final answer
    x = 121,446.52

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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.