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Finding the Fourth Proportional to 76,139.80, 114,216.90 and 20,735.80

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Solution

The fourth proportional to 76,139.80, 114,216.90 and 20,735.80 is: 31,105.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,139.80 : 114,216.90 = 20,735.80 : x
  2. Step 2: Convert to fraction form
    76,139.80/114,216.90 = 20,735.80/x
  3. Step 3: Cross multiply
    76,139.80x = 114,216.90 × 20,735.80
  4. Step 4: Simplify right side
    76,139.80x = 2,368,378,795.02
  5. Step 5: Solve for x
    x = 2,368,378,795.02/76,139.80
  6. Step 6: Final answer
    x = 31,105.66

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1.5x scale

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.