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Finding the Fourth Proportional to 281.91, 421.99 and 257.99

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Solution

The fourth proportional to 281.91, 421.99 and 257.99 is: 386.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.91 : 421.99 = 257.99 : x
  2. Step 2: Convert to fraction form
    281.91/421.99 = 257.99/x
  3. Step 3: Cross multiply
    281.91x = 421.99 × 257.99
  4. Step 4: Simplify right side
    281.91x = 108,866.45
  5. Step 5: Solve for x
    x = 108,866.45/281.91
  6. Step 6: Final answer
    x = 386.17

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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.