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Finding the Fourth Proportional to 18,761.61, 28,122.15 and 12,192.51

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Solution

The fourth proportional to 18,761.61, 28,122.15 and 12,192.51 is: 18,275.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.61 : 28,122.15 = 12,192.51 : x
  2. Step 2: Convert to fraction form
    18,761.61/28,122.15 = 12,192.51/x
  3. Step 3: Cross multiply
    18,761.61x = 28,122.15 × 12,192.51
  4. Step 4: Simplify right side
    18,761.61x = 342,879,595.10
  5. Step 5: Solve for x
    x = 342,879,595.10/18,761.61
  6. Step 6: Final answer
    x = 18,275.60

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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.