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Finding the Fourth Proportional to 21,729.99, 29,986.34 and 13,344.87

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Solution

The fourth proportional to 21,729.99, 29,986.34 and 13,344.87 is: 18,415.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.99 : 29,986.34 = 13,344.87 : x
  2. Step 2: Convert to fraction form
    21,729.99/29,986.34 = 13,344.87/x
  3. Step 3: Cross multiply
    21,729.99x = 29,986.34 × 13,344.87
  4. Step 4: Simplify right side
    21,729.99x = 400,163,692.51
  5. Step 5: Solve for x
    x = 400,163,692.51/21,729.99
  6. Step 6: Final answer
    x = 18,415.28

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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.