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Finding the Fourth Proportional to 19,420.21, 26,799.03 and 11,879.20

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Solution

The fourth proportional to 19,420.21, 26,799.03 and 11,879.20 is: 16,392.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,420.21 : 26,799.03 = 11,879.20 : x
  2. Step 2: Convert to fraction form
    19,420.21/26,799.03 = 11,879.20/x
  3. Step 3: Cross multiply
    19,420.21x = 26,799.03 × 11,879.20
  4. Step 4: Simplify right side
    19,420.21x = 318,351,037.18
  5. Step 5: Solve for x
    x = 318,351,037.18/19,420.21
  6. Step 6: Final answer
    x = 16,392.77

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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.