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Finding the Fourth Proportional to 298.98, 411.62 and 257.49

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Solution

The fourth proportional to 298.98, 411.62 and 257.49 is: 354.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.98 : 411.62 = 257.49 : x
  2. Step 2: Convert to fraction form
    298.98/411.62 = 257.49/x
  3. Step 3: Cross multiply
    298.98x = 411.62 × 257.49
  4. Step 4: Simplify right side
    298.98x = 105,986.75
  5. Step 5: Solve for x
    x = 105,986.75/298.98
  6. Step 6: Final answer
    x = 354.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.