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Finding the Fourth Proportional to 668.88, 1,002.96 and 206.52

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Solution

The fourth proportional to 668.88, 1,002.96 and 206.52 is: 309.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.88 : 1,002.96 = 206.52 : x
  2. Step 2: Convert to fraction form
    668.88/1,002.96 = 206.52/x
  3. Step 3: Cross multiply
    668.88x = 1,002.96 × 206.52
  4. Step 4: Simplify right side
    668.88x = 207,131.30
  5. Step 5: Solve for x
    x = 207,131.30/668.88
  6. Step 6: Final answer
    x = 309.67

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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.