Home / 21,148.94-29,172.30-13,605.09

Finding the Fourth Proportional to 21,148.94, 29,172.30 and 13,605.09

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Solution

The fourth proportional to 21,148.94, 29,172.30 and 13,605.09 is: 18,766.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,148.94 : 29,172.30 = 13,605.09 : x
  2. Step 2: Convert to fraction form
    21,148.94/29,172.30 = 13,605.09/x
  3. Step 3: Cross multiply
    21,148.94x = 29,172.30 × 13,605.09
  4. Step 4: Simplify right side
    21,148.94x = 396,891,767.01
  5. Step 5: Solve for x
    x = 396,891,767.01/21,148.94
  6. Step 6: Final answer
    x = 18,766.51

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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.