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Finding the Fourth Proportional to 281.82, 420.06 and 259.49

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Solution

The fourth proportional to 281.82, 420.06 and 259.49 is: 386.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.82 : 420.06 = 259.49 : x
  2. Step 2: Convert to fraction form
    281.82/420.06 = 259.49/x
  3. Step 3: Cross multiply
    281.82x = 420.06 × 259.49
  4. Step 4: Simplify right side
    281.82x = 109,001.37
  5. Step 5: Solve for x
    x = 109,001.37/281.82
  6. Step 6: Final answer
    x = 386.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.