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Finding the Fourth Proportional to 57,789.32, 86,679.66 and 20,853.32

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Solution

The fourth proportional to 57,789.32, 86,679.66 and 20,853.32 is: 31,278.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,789.32 : 86,679.66 = 20,853.32 : x
  2. Step 2: Convert to fraction form
    57,789.32/86,679.66 = 20,853.32/x
  3. Step 3: Cross multiply
    57,789.32x = 86,679.66 × 20,853.32
  4. Step 4: Simplify right side
    57,789.32x = 1,807,558,687.47
  5. Step 5: Solve for x
    x = 1,807,558,687.47/57,789.32
  6. Step 6: Final answer
    x = 31,278.42

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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.