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Finding the Fourth Proportional to 21,605.57, 29,806.40 and 13,104.44

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Solution

The fourth proportional to 21,605.57, 29,806.40 and 13,104.44 is: 18,078.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.57 : 29,806.40 = 13,104.44 : x
  2. Step 2: Convert to fraction form
    21,605.57/29,806.40 = 13,104.44/x
  3. Step 3: Cross multiply
    21,605.57x = 29,806.40 × 13,104.44
  4. Step 4: Simplify right side
    21,605.57x = 390,596,180.42
  5. Step 5: Solve for x
    x = 390,596,180.42/21,605.57
  6. Step 6: Final answer
    x = 18,078.49

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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.