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Finding the Fourth Proportional to 25,668.60, 38,502.48 and 8,138.40

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Solution

The fourth proportional to 25,668.60, 38,502.48 and 8,138.40 is: 12,207.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,668.60 : 38,502.48 = 8,138.40 : x
  2. Step 2: Convert to fraction form
    25,668.60/38,502.48 = 8,138.40/x
  3. Step 3: Cross multiply
    25,668.60x = 38,502.48 × 8,138.40
  4. Step 4: Simplify right side
    25,668.60x = 313,348,583.23
  5. Step 5: Solve for x
    x = 313,348,583.23/25,668.60
  6. Step 6: Final answer
    x = 12,207.47

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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.