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Finding the Fourth Proportional to 628.40, 942.36 and 243.56

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Solution

The fourth proportional to 628.40, 942.36 and 243.56 is: 365.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.40 : 942.36 = 243.56 : x
  2. Step 2: Convert to fraction form
    628.40/942.36 = 243.56/x
  3. Step 3: Cross multiply
    628.40x = 942.36 × 243.56
  4. Step 4: Simplify right side
    628.40x = 229,521.20
  5. Step 5: Solve for x
    x = 229,521.20/628.40
  6. Step 6: Final answer
    x = 365.25

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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.