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Finding the Fourth Proportional to 13,690.76, 20,531.13 and 6,668.67

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Solution

The fourth proportional to 13,690.76, 20,531.13 and 6,668.67 is: 10,000.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.76 : 20,531.13 = 6,668.67 : x
  2. Step 2: Convert to fraction form
    13,690.76/20,531.13 = 6,668.67/x
  3. Step 3: Cross multiply
    13,690.76x = 20,531.13 × 6,668.67
  4. Step 4: Simplify right side
    13,690.76x = 136,915,330.70
  5. Step 5: Solve for x
    x = 136,915,330.70/13,690.76
  6. Step 6: Final answer
    x = 10,000.57

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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.