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Finding the Fourth Proportional to 56,319.30, 84,489.48 and 20,789.87

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Solution

The fourth proportional to 56,319.30, 84,489.48 and 20,789.87 is: 31,188.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,319.30 : 84,489.48 = 20,789.87 : x
  2. Step 2: Convert to fraction form
    56,319.30/84,489.48 = 20,789.87/x
  3. Step 3: Cross multiply
    56,319.30x = 84,489.48 × 20,789.87
  4. Step 4: Simplify right side
    56,319.30x = 1,756,524,883.12
  5. Step 5: Solve for x
    x = 1,756,524,883.12/56,319.30
  6. Step 6: Final answer
    x = 31,188.68

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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.