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Finding the Fourth Proportional to 21,331.56, 29,437.56 and 11,899.92

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Solution

The fourth proportional to 21,331.56, 29,437.56 and 11,899.92 is: 16,421.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.56 : 29,437.56 = 11,899.92 : x
  2. Step 2: Convert to fraction form
    21,331.56/29,437.56 = 11,899.92/x
  3. Step 3: Cross multiply
    21,331.56x = 29,437.56 × 11,899.92
  4. Step 4: Simplify right side
    21,331.56x = 350,304,609.00
  5. Step 5: Solve for x
    x = 350,304,609.00/21,331.56
  6. Step 6: Final answer
    x = 16,421.89

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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.