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Finding the Fourth Proportional to 323.98, 485.36 and 258.98

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Solution

The fourth proportional to 323.98, 485.36 and 258.98 is: 387.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.98 : 485.36 = 258.98 : x
  2. Step 2: Convert to fraction form
    323.98/485.36 = 258.98/x
  3. Step 3: Cross multiply
    323.98x = 485.36 × 258.98
  4. Step 4: Simplify right side
    323.98x = 125,698.53
  5. Step 5: Solve for x
    x = 125,698.53/323.98
  6. Step 6: Final answer
    x = 387.98

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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.