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Finding the Fourth Proportional to 21,668.90, 29,911.70 and 13,600.40

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Solution

The fourth proportional to 21,668.90, 29,911.70 and 13,600.40 is: 18,773.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,668.90 : 29,911.70 = 13,600.40 : x
  2. Step 2: Convert to fraction form
    21,668.90/29,911.70 = 13,600.40/x
  3. Step 3: Cross multiply
    21,668.90x = 29,911.70 × 13,600.40
  4. Step 4: Simplify right side
    21,668.90x = 406,811,016.68
  5. Step 5: Solve for x
    x = 406,811,016.68/21,668.90
  6. Step 6: Final answer
    x = 18,773.96

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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.