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Finding the Fourth Proportional to 879.86, 1,319.22 and 378.95

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Solution

The fourth proportional to 879.86, 1,319.22 and 378.95 is: 568.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.86 : 1,319.22 = 378.95 : x
  2. Step 2: Convert to fraction form
    879.86/1,319.22 = 378.95/x
  3. Step 3: Cross multiply
    879.86x = 1,319.22 × 378.95
  4. Step 4: Simplify right side
    879.86x = 499,911.82
  5. Step 5: Solve for x
    x = 499,911.82/879.86
  6. Step 6: Final answer
    x = 568.17

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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.