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Finding the Fourth Proportional to 31,068.99, 42,880.76 and 18,321.40

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Solution

The fourth proportional to 31,068.99, 42,880.76 and 18,321.40 is: 25,286.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,068.99 : 42,880.76 = 18,321.40 : x
  2. Step 2: Convert to fraction form
    31,068.99/42,880.76 = 18,321.40/x
  3. Step 3: Cross multiply
    31,068.99x = 42,880.76 × 18,321.40
  4. Step 4: Simplify right side
    31,068.99x = 785,635,556.26
  5. Step 5: Solve for x
    x = 785,635,556.26/31,068.99
  6. Step 6: Final answer
    x = 25,286.81

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