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Finding the Fourth Proportional to 31,491.28, 43,476.04 and 20,895.28

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Solution

The fourth proportional to 31,491.28, 43,476.04 and 20,895.28 is: 28,847.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,491.28 : 43,476.04 = 20,895.28 : x
  2. Step 2: Convert to fraction form
    31,491.28/43,476.04 = 20,895.28/x
  3. Step 3: Cross multiply
    31,491.28x = 43,476.04 × 20,895.28
  4. Step 4: Simplify right side
    31,491.28x = 908,444,029.09
  5. Step 5: Solve for x
    x = 908,444,029.09/31,491.28
  6. Step 6: Final answer
    x = 28,847.48

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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.