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Finding the Fourth Proportional to 879.67, 1,319.61 and 263.39

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Solution

The fourth proportional to 879.67, 1,319.61 and 263.39 is: 395.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.67 : 1,319.61 = 263.39 : x
  2. Step 2: Convert to fraction form
    879.67/1,319.61 = 263.39/x
  3. Step 3: Cross multiply
    879.67x = 1,319.61 × 263.39
  4. Step 4: Simplify right side
    879.67x = 347,572.08
  5. Step 5: Solve for x
    x = 347,572.08/879.67
  6. Step 6: Final answer
    x = 395.12

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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.