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Finding the Fourth Proportional to 628.04, 942.12 and 211.57

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Solution

The fourth proportional to 628.04, 942.12 and 211.57 is: 317.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.04 : 942.12 = 211.57 : x
  2. Step 2: Convert to fraction form
    628.04/942.12 = 211.57/x
  3. Step 3: Cross multiply
    628.04x = 942.12 × 211.57
  4. Step 4: Simplify right side
    628.04x = 199,320.85
  5. Step 5: Solve for x
    x = 199,320.85/628.04
  6. Step 6: Final answer
    x = 317.37

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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.