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Finding the Fourth Proportional to 28,488.78, 42,733.71 and 9,790.29

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Solution

The fourth proportional to 28,488.78, 42,733.71 and 9,790.29 is: 14,685.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,488.78 : 42,733.71 = 9,790.29 : x
  2. Step 2: Convert to fraction form
    28,488.78/42,733.71 = 9,790.29/x
  3. Step 3: Cross multiply
    28,488.78x = 42,733.71 × 9,790.29
  4. Step 4: Simplify right side
    28,488.78x = 418,375,413.68
  5. Step 5: Solve for x
    x = 418,375,413.68/28,488.78
  6. Step 6: Final answer
    x = 14,685.62

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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.