Home / 21,217.36-31,825.80-12,899.68

Finding the Fourth Proportional to 21,217.36, 31,825.80 and 12,899.68

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Solution

The fourth proportional to 21,217.36, 31,825.80 and 12,899.68 is: 19,349.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217.36 : 31,825.80 = 12,899.68 : x
  2. Step 2: Convert to fraction form
    21,217.36/31,825.80 = 12,899.68/x
  3. Step 3: Cross multiply
    21,217.36x = 31,825.80 × 12,899.68
  4. Step 4: Simplify right side
    21,217.36x = 410,542,635.74
  5. Step 5: Solve for x
    x = 410,542,635.74/21,217.36
  6. Step 6: Final answer
    x = 19,349.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.