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Finding the Fourth Proportional to 20,835.80, 31,253.78 and 5,040.80

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Solution

The fourth proportional to 20,835.80, 31,253.78 and 5,040.80 is: 7,561.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,835.80 : 31,253.78 = 5,040.80 : x
  2. Step 2: Convert to fraction form
    20,835.80/31,253.78 = 5,040.80/x
  3. Step 3: Cross multiply
    20,835.80x = 31,253.78 × 5,040.80
  4. Step 4: Simplify right side
    20,835.80x = 157,544,027.76
  5. Step 5: Solve for x
    x = 157,544,027.76/20,835.80
  6. Step 6: Final answer
    x = 7,561.22

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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.