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Finding the Fourth Proportional to 21,369.80, 29,490.24 and 11,809.42

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Solution

The fourth proportional to 21,369.80, 29,490.24 and 11,809.42 is: 16,296.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,369.80 : 29,490.24 = 11,809.42 : x
  2. Step 2: Convert to fraction form
    21,369.80/29,490.24 = 11,809.42/x
  3. Step 3: Cross multiply
    21,369.80x = 29,490.24 × 11,809.42
  4. Step 4: Simplify right side
    21,369.80x = 348,262,630.06
  5. Step 5: Solve for x
    x = 348,262,630.06/21,369.80
  6. Step 6: Final answer
    x = 16,296.95

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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.