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Finding the Fourth Proportional to 81,699.66, 122,569.19 and 28,383.87

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Solution

The fourth proportional to 81,699.66, 122,569.19 and 28,383.87 is: 42,582.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,699.66 : 122,569.19 = 28,383.87 : x
  2. Step 2: Convert to fraction form
    81,699.66/122,569.19 = 28,383.87/x
  3. Step 3: Cross multiply
    81,699.66x = 122,569.19 × 28,383.87
  4. Step 4: Simplify right side
    81,699.66x = 3,478,987,954.97
  5. Step 5: Solve for x
    x = 3,478,987,954.97/81,699.66
  6. Step 6: Final answer
    x = 42,582.65

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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.