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Finding the Fourth Proportional to 12,687.85, 19,031.90 and 5,668.22

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Solution

The fourth proportional to 12,687.85, 19,031.90 and 5,668.22 is: 8,502.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.85 : 19,031.90 = 5,668.22 : x
  2. Step 2: Convert to fraction form
    12,687.85/19,031.90 = 5,668.22/x
  3. Step 3: Cross multiply
    12,687.85x = 19,031.90 × 5,668.22
  4. Step 4: Simplify right side
    12,687.85x = 107,876,996.22
  5. Step 5: Solve for x
    x = 107,876,996.22/12,687.85
  6. Step 6: Final answer
    x = 8,502.39

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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.