Home / 21,265.79-31,900.86-8,129.21

Finding the Fourth Proportional to 21,265.79, 31,900.86 and 8,129.21

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Solution

The fourth proportional to 21,265.79, 31,900.86 and 8,129.21 is: 12,194.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,265.79 : 31,900.86 = 8,129.21 : x
  2. Step 2: Convert to fraction form
    21,265.79/31,900.86 = 8,129.21/x
  3. Step 3: Cross multiply
    21,265.79x = 31,900.86 × 8,129.21
  4. Step 4: Simplify right side
    21,265.79x = 259,328,630.62
  5. Step 5: Solve for x
    x = 259,328,630.62/21,265.79
  6. Step 6: Final answer
    x = 12,194.64

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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.