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Finding the Fourth Proportional to 19,919.86, 29,879.81 and 5,128.81

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Solution

The fourth proportional to 19,919.86, 29,879.81 and 5,128.81 is: 7,693.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.86 : 29,879.81 = 5,128.81 : x
  2. Step 2: Convert to fraction form
    19,919.86/29,879.81 = 5,128.81/x
  3. Step 3: Cross multiply
    19,919.86x = 29,879.81 × 5,128.81
  4. Step 4: Simplify right side
    19,919.86x = 153,247,787.22
  5. Step 5: Solve for x
    x = 153,247,787.22/19,919.86
  6. Step 6: Final answer
    x = 7,693.22

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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.