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Finding the Fourth Proportional to 19,215.51, 28,827.09 and 8,122.11

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Solution

The fourth proportional to 19,215.51, 28,827.09 and 8,122.11 is: 12,184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,215.51 : 28,827.09 = 8,122.11 : x
  2. Step 2: Convert to fraction form
    19,215.51/28,827.09 = 8,122.11/x
  3. Step 3: Cross multiply
    19,215.51x = 28,827.09 × 8,122.11
  4. Step 4: Simplify right side
    19,215.51x = 234,136,795.96
  5. Step 5: Solve for x
    x = 234,136,795.96/19,215.51
  6. Step 6: Final answer
    x = 12,184.78

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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.