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Finding the Fourth Proportional to 31,643.56, 43,664.86 and 18,212.20

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Solution

The fourth proportional to 31,643.56, 43,664.86 and 18,212.20 is: 25,130.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,643.56 : 43,664.86 = 18,212.20 : x
  2. Step 2: Convert to fraction form
    31,643.56/43,664.86 = 18,212.20/x
  3. Step 3: Cross multiply
    31,643.56x = 43,664.86 × 18,212.20
  4. Step 4: Simplify right side
    31,643.56x = 795,233,163.29
  5. Step 5: Solve for x
    x = 795,233,163.29/31,643.56
  6. Step 6: Final answer
    x = 25,130.96

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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.