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Finding the Fourth Proportional to 19,921.91, 29,879.92 and 7,440.38

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Solution

The fourth proportional to 19,921.91, 29,879.92 and 7,440.38 is: 11,159.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,921.91 : 29,879.92 = 7,440.38 : x
  2. Step 2: Convert to fraction form
    19,921.91/29,879.92 = 7,440.38/x
  3. Step 3: Cross multiply
    19,921.91x = 29,879.92 × 7,440.38
  4. Step 4: Simplify right side
    19,921.91x = 222,317,772.57
  5. Step 5: Solve for x
    x = 222,317,772.57/19,921.91
  6. Step 6: Final answer
    x = 11,159.46

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1.5x scale

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.