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Finding the Fourth Proportional to 668.76, 1,002.57 and 321.85

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Solution

The fourth proportional to 668.76, 1,002.57 and 321.85 is: 482.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.76 : 1,002.57 = 321.85 : x
  2. Step 2: Convert to fraction form
    668.76/1,002.57 = 321.85/x
  3. Step 3: Cross multiply
    668.76x = 1,002.57 × 321.85
  4. Step 4: Simplify right side
    668.76x = 322,677.15
  5. Step 5: Solve for x
    x = 322,677.15/668.76
  6. Step 6: Final answer
    x = 482.50

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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.