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Finding the Fourth Proportional to 39,900.66, 55,062.90 and 21,995.96

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Solution

The fourth proportional to 39,900.66, 55,062.90 and 21,995.96 is: 30,354.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,900.66 : 55,062.90 = 21,995.96 : x
  2. Step 2: Convert to fraction form
    39,900.66/55,062.90 = 21,995.96/x
  3. Step 3: Cross multiply
    39,900.66x = 55,062.90 × 21,995.96
  4. Step 4: Simplify right side
    39,900.66x = 1,211,161,345.88
  5. Step 5: Solve for x
    x = 1,211,161,345.88/39,900.66
  6. Step 6: Final answer
    x = 30,354.42

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1.5x scale

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.