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Finding the Fourth Proportional to 18,980.73, 28,420.07 and 12,390.57

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Solution

The fourth proportional to 18,980.73, 28,420.07 and 12,390.57 is: 18,552.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.73 : 28,420.07 = 12,390.57 : x
  2. Step 2: Convert to fraction form
    18,980.73/28,420.07 = 12,390.57/x
  3. Step 3: Cross multiply
    18,980.73x = 28,420.07 × 12,390.57
  4. Step 4: Simplify right side
    18,980.73x = 352,140,804.79
  5. Step 5: Solve for x
    x = 352,140,804.79/18,980.73
  6. Step 6: Final answer
    x = 18,552.54

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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.