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Finding the Fourth Proportional to 21,425.80, 29,567.46 and 11,993.80

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Solution

The fourth proportional to 21,425.80, 29,567.46 and 11,993.80 is: 16,551.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,425.80 : 29,567.46 = 11,993.80 : x
  2. Step 2: Convert to fraction form
    21,425.80/29,567.46 = 11,993.80/x
  3. Step 3: Cross multiply
    21,425.80x = 29,567.46 × 11,993.80
  4. Step 4: Simplify right side
    21,425.80x = 354,626,201.75
  5. Step 5: Solve for x
    x = 354,626,201.75/21,425.80
  6. Step 6: Final answer
    x = 16,551.36

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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.