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Finding the Fourth Proportional to 13,245.95, 18,279.47 and 7,940.76

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Solution

The fourth proportional to 13,245.95, 18,279.47 and 7,940.76 is: 10,958.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,245.95 : 18,279.47 = 7,940.76 : x
  2. Step 2: Convert to fraction form
    13,245.95/18,279.47 = 7,940.76/x
  3. Step 3: Cross multiply
    13,245.95x = 18,279.47 × 7,940.76
  4. Step 4: Simplify right side
    13,245.95x = 145,152,844.49
  5. Step 5: Solve for x
    x = 145,152,844.49/13,245.95
  6. Step 6: Final answer
    x = 10,958.29

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Double scale
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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.