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Finding the Fourth Proportional to 673.50, 1,009.89 and 211.15

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Solution

The fourth proportional to 673.50, 1,009.89 and 211.15 is: 316.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.50 : 1,009.89 = 211.15 : x
  2. Step 2: Convert to fraction form
    673.50/1,009.89 = 211.15/x
  3. Step 3: Cross multiply
    673.50x = 1,009.89 × 211.15
  4. Step 4: Simplify right side
    673.50x = 213,239.54
  5. Step 5: Solve for x
    x = 213,239.54/673.50
  6. Step 6: Final answer
    x = 316.61

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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.