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Finding the Fourth Proportional to 879.45, 1,318.99 and 263.15

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Solution

The fourth proportional to 879.45, 1,318.99 and 263.15 is: 394.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.45 : 1,318.99 = 263.15 : x
  2. Step 2: Convert to fraction form
    879.45/1,318.99 = 263.15/x
  3. Step 3: Cross multiply
    879.45x = 1,318.99 × 263.15
  4. Step 4: Simplify right side
    879.45x = 347,092.22
  5. Step 5: Solve for x
    x = 347,092.22/879.45
  6. Step 6: Final answer
    x = 394.67

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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.