Home / 39,720.19-54,811.69-21,812.31

Finding the Fourth Proportional to 39,720.19, 54,811.69 and 21,812.31

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Solution

The fourth proportional to 39,720.19, 54,811.69 and 21,812.31 is: 30,099.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.19 : 54,811.69 = 21,812.31 : x
  2. Step 2: Convert to fraction form
    39,720.19/54,811.69 = 21,812.31/x
  3. Step 3: Cross multiply
    39,720.19x = 54,811.69 × 21,812.31
  4. Step 4: Simplify right side
    39,720.19x = 1,195,569,573.90
  5. Step 5: Solve for x
    x = 1,195,569,573.90/39,720.19
  6. Step 6: Final answer
    x = 30,099.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.