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Finding the Fourth Proportional to 21,392.70, 29,522.83 and 13,218.11

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Solution

The fourth proportional to 21,392.70, 29,522.83 and 13,218.11 is: 18,241.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,392.70 : 29,522.83 = 13,218.11 : x
  2. Step 2: Convert to fraction form
    21,392.70/29,522.83 = 13,218.11/x
  3. Step 3: Cross multiply
    21,392.70x = 29,522.83 × 13,218.11
  4. Step 4: Simplify right side
    21,392.70x = 390,236,021.64
  5. Step 5: Solve for x
    x = 390,236,021.64/21,392.70
  6. Step 6: Final answer
    x = 18,241.55

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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.