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Finding the Fourth Proportional to 19,671.68, 29,499.84 and 8,720

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Solution

The fourth proportional to 19,671.68, 29,499.84 and 8,720 is: 13,076.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,671.68 : 29,499.84 = 8,720 : x
  2. Step 2: Convert to fraction form
    19,671.68/29,499.84 = 8,720/x
  3. Step 3: Cross multiply
    19,671.68x = 29,499.84 × 8,720
  4. Step 4: Simplify right side
    19,671.68x = 257,238,604.80
  5. Step 5: Solve for x
    x = 257,238,604.80/19,671.68
  6. Step 6: Final answer
    x = 13,076.60

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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.