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Finding the Fourth Proportional to 208.48, 312.12 and 157.33

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Solution

The fourth proportional to 208.48, 312.12 and 157.33 is: 235.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.48 : 312.12 = 157.33 : x
  2. Step 2: Convert to fraction form
    208.48/312.12 = 157.33/x
  3. Step 3: Cross multiply
    208.48x = 312.12 × 157.33
  4. Step 4: Simplify right side
    208.48x = 49,105.84
  5. Step 5: Solve for x
    x = 49,105.84/208.48
  6. Step 6: Final answer
    x = 235.54

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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.