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Finding the Fourth Proportional to 28,379.40, 42,568.98 and 8,657.90

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Solution

The fourth proportional to 28,379.40, 42,568.98 and 8,657.90 is: 12,986.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.40 : 42,568.98 = 8,657.90 : x
  2. Step 2: Convert to fraction form
    28,379.40/42,568.98 = 8,657.90/x
  3. Step 3: Cross multiply
    28,379.40x = 42,568.98 × 8,657.90
  4. Step 4: Simplify right side
    28,379.40x = 368,557,971.94
  5. Step 5: Solve for x
    x = 368,557,971.94/28,379.40
  6. Step 6: Final answer
    x = 12,986.81

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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.