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Finding the Fourth Proportional to 21,079.92, 31,619.74 and 8,599.88

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Solution

The fourth proportional to 21,079.92, 31,619.74 and 8,599.88 is: 12,899.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.92 : 31,619.74 = 8,599.88 : x
  2. Step 2: Convert to fraction form
    21,079.92/31,619.74 = 8,599.88/x
  3. Step 3: Cross multiply
    21,079.92x = 31,619.74 × 8,599.88
  4. Step 4: Simplify right side
    21,079.92x = 271,925,969.63
  5. Step 5: Solve for x
    x = 271,925,969.63/21,079.92
  6. Step 6: Final answer
    x = 12,899.76

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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.