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Finding the Fourth Proportional to 312.98, 469.47 and 185.54

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Solution

The fourth proportional to 312.98, 469.47 and 185.54 is: 278.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.98 : 469.47 = 185.54 : x
  2. Step 2: Convert to fraction form
    312.98/469.47 = 185.54/x
  3. Step 3: Cross multiply
    312.98x = 469.47 × 185.54
  4. Step 4: Simplify right side
    312.98x = 87,105.46
  5. Step 5: Solve for x
    x = 87,105.46/312.98
  6. Step 6: Final answer
    x = 278.31

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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.