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Finding the Fourth Proportional to 20,801.35, 28,705.84 and 11,369.89

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Solution

The fourth proportional to 20,801.35, 28,705.84 and 11,369.89 is: 15,690.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.35 : 28,705.84 = 11,369.89 : x
  2. Step 2: Convert to fraction form
    20,801.35/28,705.84 = 11,369.89/x
  3. Step 3: Cross multiply
    20,801.35x = 28,705.84 × 11,369.89
  4. Step 4: Simplify right side
    20,801.35x = 326,382,243.16
  5. Step 5: Solve for x
    x = 326,382,243.16/20,801.35
  6. Step 6: Final answer
    x = 15,690.44

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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.