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Finding the Fourth Proportional to 38,811, 53,559.18 and 21,147

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Solution

The fourth proportional to 38,811, 53,559.18 and 21,147 is: 29,182.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,811 : 53,559.18 = 21,147 : x
  2. Step 2: Convert to fraction form
    38,811/53,559.18 = 21,147/x
  3. Step 3: Cross multiply
    38,811x = 53,559.18 × 21,147
  4. Step 4: Simplify right side
    38,811x = 1,132,615,979.46
  5. Step 5: Solve for x
    x = 1,132,615,979.46/38,811
  6. Step 6: Final answer
    x = 29,182.86

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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.