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Finding the Fourth Proportional to 31,716.60, 43,768.80 and 18,287.80

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Solution

The fourth proportional to 31,716.60, 43,768.80 and 18,287.80 is: 25,237.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,716.60 : 43,768.80 = 18,287.80 : x
  2. Step 2: Convert to fraction form
    31,716.60/43,768.80 = 18,287.80/x
  3. Step 3: Cross multiply
    31,716.60x = 43,768.80 × 18,287.80
  4. Step 4: Simplify right side
    31,716.60x = 800,435,060.64
  5. Step 5: Solve for x
    x = 800,435,060.64/31,716.60
  6. Step 6: Final answer
    x = 25,237.10

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1.5x scale

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.