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Finding the Fourth Proportional to 281, 386.88 and 268

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Solution

The fourth proportional to 281, 386.88 and 268 is: 368.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    281 : 386.88 = 268 : x
  2. Step 2: Convert to fraction form
    281/386.88 = 268/x
  3. Step 3: Cross multiply
    281x = 386.88 × 268
  4. Step 4: Simplify right side
    281x = 103,683.84
  5. Step 5: Solve for x
    x = 103,683.84/281
  6. Step 6: Final answer
    x = 368.98

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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.