Home / 21,255.75-31,878.63-8,763.39

Finding the Fourth Proportional to 21,255.75, 31,878.63 and 8,763.39

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Solution

The fourth proportional to 21,255.75, 31,878.63 and 8,763.39 is: 13,143.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,255.75 : 31,878.63 = 8,763.39 : x
  2. Step 2: Convert to fraction form
    21,255.75/31,878.63 = 8,763.39/x
  3. Step 3: Cross multiply
    21,255.75x = 31,878.63 × 8,763.39
  4. Step 4: Simplify right side
    21,255.75x = 279,364,867.36
  5. Step 5: Solve for x
    x = 279,364,867.36/21,255.75
  6. Step 6: Final answer
    x = 13,143.03

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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.