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Finding the Fourth Proportional to 38,424, 53,025.12 and 20,760

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Solution

The fourth proportional to 38,424, 53,025.12 and 20,760 is: 28,648.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,424 : 53,025.12 = 20,760 : x
  2. Step 2: Convert to fraction form
    38,424/53,025.12 = 20,760/x
  3. Step 3: Cross multiply
    38,424x = 53,025.12 × 20,760
  4. Step 4: Simplify right side
    38,424x = 1,100,801,491.20
  5. Step 5: Solve for x
    x = 1,100,801,491.20/38,424
  6. Step 6: Final answer
    x = 28,648.80

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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.