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Finding the Fourth Proportional to 14,980.21, 20,680.17 and 9,316.78

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Solution

The fourth proportional to 14,980.21, 20,680.17 and 9,316.78 is: 12,861.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,980.21 : 20,680.17 = 9,316.78 : x
  2. Step 2: Convert to fraction form
    14,980.21/20,680.17 = 9,316.78/x
  3. Step 3: Cross multiply
    14,980.21x = 20,680.17 × 9,316.78
  4. Step 4: Simplify right side
    14,980.21x = 192,672,490.85
  5. Step 5: Solve for x
    x = 192,672,490.85/14,980.21
  6. Step 6: Final answer
    x = 12,861.81

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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.