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Finding the Fourth Proportional to 20,590.20, 30,885.30 and 11,817.90

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Solution

The fourth proportional to 20,590.20, 30,885.30 and 11,817.90 is: 17,726.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,590.20 : 30,885.30 = 11,817.90 : x
  2. Step 2: Convert to fraction form
    20,590.20/30,885.30 = 11,817.90/x
  3. Step 3: Cross multiply
    20,590.20x = 30,885.30 × 11,817.90
  4. Step 4: Simplify right side
    20,590.20x = 364,999,386.87
  5. Step 5: Solve for x
    x = 364,999,386.87/20,590.20
  6. Step 6: Final answer
    x = 17,726.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.