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Finding the Fourth Proportional to 56,709.68, 78,128.34 and 40,766.56

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Solution

The fourth proportional to 56,709.68, 78,128.34 and 40,766.56 is: 56,163.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,709.68 : 78,128.34 = 40,766.56 : x
  2. Step 2: Convert to fraction form
    56,709.68/78,128.34 = 40,766.56/x
  3. Step 3: Cross multiply
    56,709.68x = 78,128.34 × 40,766.56
  4. Step 4: Simplify right side
    56,709.68x = 3,185,023,660.31
  5. Step 5: Solve for x
    x = 3,185,023,660.31/56,709.68
  6. Step 6: Final answer
    x = 56,163.67

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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.