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Finding the Fourth Proportional to 13,245.99, 18,280.58 and 7,278.85

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Solution

The fourth proportional to 13,245.99, 18,280.58 and 7,278.85 is: 10,045.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,245.99 : 18,280.58 = 7,278.85 : x
  2. Step 2: Convert to fraction form
    13,245.99/18,280.58 = 7,278.85/x
  3. Step 3: Cross multiply
    13,245.99x = 18,280.58 × 7,278.85
  4. Step 4: Simplify right side
    13,245.99x = 133,061,599.73
  5. Step 5: Solve for x
    x = 133,061,599.73/13,245.99
  6. Step 6: Final answer
    x = 10,045.43

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Half scale
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Double scale
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Similar ratio
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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.