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Finding the Fourth Proportional to 20,641.99, 28,494.65 and 13,936.69

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Solution

The fourth proportional to 20,641.99, 28,494.65 and 13,936.69 is: 19,238.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.99 : 28,494.65 = 13,936.69 : x
  2. Step 2: Convert to fraction form
    20,641.99/28,494.65 = 13,936.69/x
  3. Step 3: Cross multiply
    20,641.99x = 28,494.65 × 13,936.69
  4. Step 4: Simplify right side
    20,641.99x = 397,121,103.71
  5. Step 5: Solve for x
    x = 397,121,103.71/20,641.99
  6. Step 6: Final answer
    x = 19,238.51

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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.