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Finding the Fourth Proportional to 18,761.98, 28,122.72 and 12,192.88

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Solution

The fourth proportional to 18,761.98, 28,122.72 and 12,192.88 is: 18,276.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.98 : 28,122.72 = 12,192.88 : x
  2. Step 2: Convert to fraction form
    18,761.98/28,122.72 = 12,192.88/x
  3. Step 3: Cross multiply
    18,761.98x = 28,122.72 × 12,192.88
  4. Step 4: Simplify right side
    18,761.98x = 342,896,950.23
  5. Step 5: Solve for x
    x = 342,896,950.23/18,761.98
  6. Step 6: Final answer
    x = 18,276.16

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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.