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Finding the Fourth Proportional to 21,388.80, 29,519.52 and 11,958

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Solution

The fourth proportional to 21,388.80, 29,519.52 and 11,958 is: 16,503.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.80 : 29,519.52 = 11,958 : x
  2. Step 2: Convert to fraction form
    21,388.80/29,519.52 = 11,958/x
  3. Step 3: Cross multiply
    21,388.80x = 29,519.52 × 11,958
  4. Step 4: Simplify right side
    21,388.80x = 352,994,420.16
  5. Step 5: Solve for x
    x = 352,994,420.16/21,388.80
  6. Step 6: Final answer
    x = 16,503.70

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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.