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Finding the Fourth Proportional to 674.42, 1,011.20 and 212.05

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Solution

The fourth proportional to 674.42, 1,011.20 and 212.05 is: 317.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.42 : 1,011.20 = 212.05 : x
  2. Step 2: Convert to fraction form
    674.42/1,011.20 = 212.05/x
  3. Step 3: Cross multiply
    674.42x = 1,011.20 × 212.05
  4. Step 4: Simplify right side
    674.42x = 214,421.37
  5. Step 5: Solve for x
    x = 214,421.37/674.42
  6. Step 6: Final answer
    x = 317.93

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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.