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Finding the Fourth Proportional to 19,918.80, 29,838.96 and 11,126.88

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Solution

The fourth proportional to 19,918.80, 29,838.96 and 11,126.88 is: 16,668.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,918.80 : 29,838.96 = 11,126.88 : x
  2. Step 2: Convert to fraction form
    19,918.80/29,838.96 = 11,126.88/x
  3. Step 3: Cross multiply
    19,918.80x = 29,838.96 × 11,126.88
  4. Step 4: Simplify right side
    19,918.80x = 332,014,527.24
  5. Step 5: Solve for x
    x = 332,014,527.24/19,918.80
  6. Step 6: Final answer
    x = 16,668.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.