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Finding the Fourth Proportional to 18,711.94, 28,048.98 and 12,142.30

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Solution

The fourth proportional to 18,711.94, 28,048.98 and 12,142.30 is: 18,201.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.94 : 28,048.98 = 12,142.30 : x
  2. Step 2: Convert to fraction form
    18,711.94/28,048.98 = 12,142.30/x
  3. Step 3: Cross multiply
    18,711.94x = 28,048.98 × 12,142.30
  4. Step 4: Simplify right side
    18,711.94x = 340,579,129.85
  5. Step 5: Solve for x
    x = 340,579,129.85/18,711.94
  6. Step 6: Final answer
    x = 18,201.17

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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.