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Finding the Fourth Proportional to 57,756, 79,703.52 and 31,260

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Solution

The fourth proportional to 57,756, 79,703.52 and 31,260 is: 43,138.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,756 : 79,703.52 = 31,260 : x
  2. Step 2: Convert to fraction form
    57,756/79,703.52 = 31,260/x
  3. Step 3: Cross multiply
    57,756x = 79,703.52 × 31,260
  4. Step 4: Simplify right side
    57,756x = 2,491,532,035.20
  5. Step 5: Solve for x
    x = 2,491,532,035.20/57,756
  6. Step 6: Final answer
    x = 43,138.93

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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.