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Finding the Fourth Proportional to 20,620.13, 28,479.09 and 13,894.09

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Solution

The fourth proportional to 20,620.13, 28,479.09 and 13,894.09 is: 19,189.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.13 : 28,479.09 = 13,894.09 : x
  2. Step 2: Convert to fraction form
    20,620.13/28,479.09 = 13,894.09/x
  3. Step 3: Cross multiply
    20,620.13x = 28,479.09 × 13,894.09
  4. Step 4: Simplify right side
    20,620.13x = 395,690,827.71
  5. Step 5: Solve for x
    x = 395,690,827.71/20,620.13
  6. Step 6: Final answer
    x = 19,189.55

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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.