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Finding the Fourth Proportional to 39,798.31, 54,920.32 and 21,893.16

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Solution

The fourth proportional to 39,798.31, 54,920.32 and 21,893.16 is: 30,211.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,798.31 : 54,920.32 = 21,893.16 : x
  2. Step 2: Convert to fraction form
    39,798.31/54,920.32 = 21,893.16/x
  3. Step 3: Cross multiply
    39,798.31x = 54,920.32 × 21,893.16
  4. Step 4: Simplify right side
    39,798.31x = 1,202,379,353.01
  5. Step 5: Solve for x
    x = 1,202,379,353.01/39,798.31
  6. Step 6: Final answer
    x = 30,211.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.