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Finding the Fourth Proportional to 673.45, 1,010.18 and 211.21

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Solution

The fourth proportional to 673.45, 1,010.18 and 211.21 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.45 : 1,010.18 = 211.21 : x
  2. Step 2: Convert to fraction form
    673.45/1,010.18 = 211.21/x
  3. Step 3: Cross multiply
    673.45x = 1,010.18 × 211.21
  4. Step 4: Simplify right side
    673.45x = 213,362.38
  5. Step 5: Solve for x
    x = 213,362.38/673.45
  6. Step 6: Final answer
    x = 316.82

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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.