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Finding the Fourth Proportional to 39,978.83, 55,170.99 and 22,073.87

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Solution

The fourth proportional to 39,978.83, 55,170.99 and 22,073.87 is: 30,462.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.83 : 55,170.99 = 22,073.87 : x
  2. Step 2: Convert to fraction form
    39,978.83/55,170.99 = 22,073.87/x
  3. Step 3: Cross multiply
    39,978.83x = 55,170.99 × 22,073.87
  4. Step 4: Simplify right side
    39,978.83x = 1,217,837,261.03
  5. Step 5: Solve for x
    x = 1,217,837,261.03/39,978.83
  6. Step 6: Final answer
    x = 30,462.05

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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.