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Finding the Fourth Proportional to 675.02, 1,012.20 and 212.64

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Solution

The fourth proportional to 675.02, 1,012.20 and 212.64 is: 318.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.02 : 1,012.20 = 212.64 : x
  2. Step 2: Convert to fraction form
    675.02/1,012.20 = 212.64/x
  3. Step 3: Cross multiply
    675.02x = 1,012.20 × 212.64
  4. Step 4: Simplify right side
    675.02x = 215,234.21
  5. Step 5: Solve for x
    x = 215,234.21/675.02
  6. Step 6: Final answer
    x = 318.86

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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.