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Finding the Fourth Proportional to 20,993.65, 28,969.09 and 12,926.02

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Solution

The fourth proportional to 20,993.65, 28,969.09 and 12,926.02 is: 17,836.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.65 : 28,969.09 = 12,926.02 : x
  2. Step 2: Convert to fraction form
    20,993.65/28,969.09 = 12,926.02/x
  3. Step 3: Cross multiply
    20,993.65x = 28,969.09 × 12,926.02
  4. Step 4: Simplify right side
    20,993.65x = 374,455,109.14
  5. Step 5: Solve for x
    x = 374,455,109.14/20,993.65
  6. Step 6: Final answer
    x = 17,836.59

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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.