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Finding the Fourth Proportional to 21,363.36, 29,481.24 and 12,870.24

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Solution

The fourth proportional to 21,363.36, 29,481.24 and 12,870.24 is: 17,760.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,363.36 : 29,481.24 = 12,870.24 : x
  2. Step 2: Convert to fraction form
    21,363.36/29,481.24 = 12,870.24/x
  3. Step 3: Cross multiply
    21,363.36x = 29,481.24 × 12,870.24
  4. Step 4: Simplify right side
    21,363.36x = 379,430,634.30
  5. Step 5: Solve for x
    x = 379,430,634.30/21,363.36
  6. Step 6: Final answer
    x = 17,760.81

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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.