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Finding the Fourth Proportional to 20,137.30, 30,205.95 and 18,679.30

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Solution

The fourth proportional to 20,137.30, 30,205.95 and 18,679.30 is: 28,018.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,137.30 : 30,205.95 = 18,679.30 : x
  2. Step 2: Convert to fraction form
    20,137.30/30,205.95 = 18,679.30/x
  3. Step 3: Cross multiply
    20,137.30x = 30,205.95 × 18,679.30
  4. Step 4: Simplify right side
    20,137.30x = 564,226,001.84
  5. Step 5: Solve for x
    x = 564,226,001.84/20,137.30
  6. Step 6: Final answer
    x = 28,018.95

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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.