Home / 81,108.38-121,688.64-38,991.52

Finding the Fourth Proportional to 81,108.38, 121,688.64 and 38,991.52

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Solution

The fourth proportional to 81,108.38, 121,688.64 and 38,991.52 is: 58,499.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,108.38 : 121,688.64 = 38,991.52 : x
  2. Step 2: Convert to fraction form
    81,108.38/121,688.64 = 38,991.52/x
  3. Step 3: Cross multiply
    81,108.38x = 121,688.64 × 38,991.52
  4. Step 4: Simplify right side
    81,108.38x = 4,744,825,040.33
  5. Step 5: Solve for x
    x = 4,744,825,040.33/81,108.38
  6. Step 6: Final answer
    x = 58,499.81

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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.