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Finding the Fourth Proportional to 21,114.78, 28,983.17 and 18,671.20

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Solution

The fourth proportional to 21,114.78, 28,983.17 and 18,671.20 is: 25,628.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,114.78 : 28,983.17 = 18,671.20 : x
  2. Step 2: Convert to fraction form
    21,114.78/28,983.17 = 18,671.20/x
  3. Step 3: Cross multiply
    21,114.78x = 28,983.17 × 18,671.20
  4. Step 4: Simplify right side
    21,114.78x = 541,150,563.70
  5. Step 5: Solve for x
    x = 541,150,563.70/21,114.78
  6. Step 6: Final answer
    x = 25,628.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.