Home / 21,272.64-31,913.58-8,128.76

Finding the Fourth Proportional to 21,272.64, 31,913.58 and 8,128.76

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Solution

The fourth proportional to 21,272.64, 31,913.58 and 8,128.76 is: 12,194.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.64 : 31,913.58 = 8,128.76 : x
  2. Step 2: Convert to fraction form
    21,272.64/31,913.58 = 8,128.76/x
  3. Step 3: Cross multiply
    21,272.64x = 31,913.58 × 8,128.76
  4. Step 4: Simplify right side
    21,272.64x = 259,417,832.56
  5. Step 5: Solve for x
    x = 259,417,832.56/21,272.64
  6. Step 6: Final answer
    x = 12,194.91

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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.