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Finding the Fourth Proportional to 42,865.60, 64,295.92 and 12,879.19

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Solution

The fourth proportional to 42,865.60, 64,295.92 and 12,879.19 is: 19,318.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,865.60 : 64,295.92 = 12,879.19 : x
  2. Step 2: Convert to fraction form
    42,865.60/64,295.92 = 12,879.19/x
  3. Step 3: Cross multiply
    42,865.60x = 64,295.92 × 12,879.19
  4. Step 4: Simplify right side
    42,865.60x = 828,079,369.90
  5. Step 5: Solve for x
    x = 828,079,369.90/42,865.60
  6. Step 6: Final answer
    x = 19,318.04

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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.