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Finding the Fourth Proportional to 19,239.90, 28,837.98 and 8,139.66

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Solution

The fourth proportional to 19,239.90, 28,837.98 and 8,139.66 is: 12,200.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,239.90 : 28,837.98 = 8,139.66 : x
  2. Step 2: Convert to fraction form
    19,239.90/28,837.98 = 8,139.66/x
  3. Step 3: Cross multiply
    19,239.90x = 28,837.98 × 8,139.66
  4. Step 4: Simplify right side
    19,239.90x = 234,731,352.29
  5. Step 5: Solve for x
    x = 234,731,352.29/19,239.90
  6. Step 6: Final answer
    x = 12,200.24

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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.