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Finding the Fourth Proportional to 281.68, 388.70 and 171.08

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Solution

The fourth proportional to 281.68, 388.70 and 171.08 is: 236.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.68 : 388.70 = 171.08 : x
  2. Step 2: Convert to fraction form
    281.68/388.70 = 171.08/x
  3. Step 3: Cross multiply
    281.68x = 388.70 × 171.08
  4. Step 4: Simplify right side
    281.68x = 66,498.80
  5. Step 5: Solve for x
    x = 66,498.80/281.68
  6. Step 6: Final answer
    x = 236.08

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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.