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Finding the Fourth Proportional to 281.85, 388.98 and 155.83

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Solution

The fourth proportional to 281.85, 388.98 and 155.83 is: 215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.85 : 388.98 = 155.83 : x
  2. Step 2: Convert to fraction form
    281.85/388.98 = 155.83/x
  3. Step 3: Cross multiply
    281.85x = 388.98 × 155.83
  4. Step 4: Simplify right side
    281.85x = 60,613.44
  5. Step 5: Solve for x
    x = 60,613.44/281.85
  6. Step 6: Final answer
    x = 215.05

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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.