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Finding the Fourth Proportional to 879.80, 1,319.63 and 221.67

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Solution

The fourth proportional to 879.80, 1,319.63 and 221.67 is: 332.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.80 : 1,319.63 = 221.67 : x
  2. Step 2: Convert to fraction form
    879.80/1,319.63 = 221.67/x
  3. Step 3: Cross multiply
    879.80x = 1,319.63 × 221.67
  4. Step 4: Simplify right side
    879.80x = 292,521.27
  5. Step 5: Solve for x
    x = 292,521.27/879.80
  6. Step 6: Final answer
    x = 332.49

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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.