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Finding the Fourth Proportional to 39,057.77, 53,899.77 and 21,152.81

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Solution

The fourth proportional to 39,057.77, 53,899.77 and 21,152.81 is: 29,190.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,057.77 : 53,899.77 = 21,152.81 : x
  2. Step 2: Convert to fraction form
    39,057.77/53,899.77 = 21,152.81/x
  3. Step 3: Cross multiply
    39,057.77x = 53,899.77 × 21,152.81
  4. Step 4: Simplify right side
    39,057.77x = 1,140,131,324.35
  5. Step 5: Solve for x
    x = 1,140,131,324.35/39,057.77
  6. Step 6: Final answer
    x = 29,190.90

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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.