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Finding the Fourth Proportional to 281.49, 388.45 and 157.15

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Solution

The fourth proportional to 281.49, 388.45 and 157.15 is: 216.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.49 : 388.45 = 157.15 : x
  2. Step 2: Convert to fraction form
    281.49/388.45 = 157.15/x
  3. Step 3: Cross multiply
    281.49x = 388.45 × 157.15
  4. Step 4: Simplify right side
    281.49x = 61,044.92
  5. Step 5: Solve for x
    x = 61,044.92/281.49
  6. Step 6: Final answer
    x = 216.86

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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.