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Finding the Fourth Proportional to 13,958.70, 20,931.45 and 8,117.10

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Solution

The fourth proportional to 13,958.70, 20,931.45 and 8,117.10 is: 12,171.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,958.70 : 20,931.45 = 8,117.10 : x
  2. Step 2: Convert to fraction form
    13,958.70/20,931.45 = 8,117.10/x
  3. Step 3: Cross multiply
    13,958.70x = 20,931.45 × 8,117.10
  4. Step 4: Simplify right side
    13,958.70x = 169,902,672.80
  5. Step 5: Solve for x
    x = 169,902,672.80/13,958.70
  6. Step 6: Final answer
    x = 12,171.81

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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.