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Finding the Fourth Proportional to 879.75, 1,319.58 and 221.61

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Solution

The fourth proportional to 879.75, 1,319.58 and 221.61 is: 332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.75 : 1,319.58 = 221.61 : x
  2. Step 2: Convert to fraction form
    879.75/1,319.58 = 221.61/x
  3. Step 3: Cross multiply
    879.75x = 1,319.58 × 221.61
  4. Step 4: Simplify right side
    879.75x = 292,432.12
  5. Step 5: Solve for x
    x = 292,432.12/879.75
  6. Step 6: Final answer
    x = 332.40

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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.