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Finding the Fourth Proportional to 21,576, 29,775.60 and 13,190.88

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Solution

The fourth proportional to 21,576, 29,775.60 and 13,190.88 is: 18,203.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,576 : 29,775.60 = 13,190.88 : x
  2. Step 2: Convert to fraction form
    21,576/29,775.60 = 13,190.88/x
  3. Step 3: Cross multiply
    21,576x = 29,775.60 × 13,190.88
  4. Step 4: Simplify right side
    21,576x = 392,766,366.53
  5. Step 5: Solve for x
    x = 392,766,366.53/21,576
  6. Step 6: Final answer
    x = 18,203.85

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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.