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Finding the Fourth Proportional to 38,718.80, 57,991.80 and 31,806.80

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Solution

The fourth proportional to 38,718.80, 57,991.80 and 31,806.80 is: 47,639.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,718.80 : 57,991.80 = 31,806.80 : x
  2. Step 2: Convert to fraction form
    38,718.80/57,991.80 = 31,806.80/x
  3. Step 3: Cross multiply
    38,718.80x = 57,991.80 × 31,806.80
  4. Step 4: Simplify right side
    38,718.80x = 1,844,533,584.24
  5. Step 5: Solve for x
    x = 1,844,533,584.24/38,718.80
  6. Step 6: Final answer
    x = 47,639.22

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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.