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Finding the Fourth Proportional to 213.78, 295.05 and 155.60

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Solution

The fourth proportional to 213.78, 295.05 and 155.60 is: 214.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.78 : 295.05 = 155.60 : x
  2. Step 2: Convert to fraction form
    213.78/295.05 = 155.60/x
  3. Step 3: Cross multiply
    213.78x = 295.05 × 155.60
  4. Step 4: Simplify right side
    213.78x = 45,909.78
  5. Step 5: Solve for x
    x = 45,909.78/213.78
  6. Step 6: Final answer
    x = 214.75

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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.