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Finding the Fourth Proportional to 155.48, 213.98 and 111.74

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Solution

The fourth proportional to 155.48, 213.98 and 111.74 is: 153.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.48 : 213.98 = 111.74 : x
  2. Step 2: Convert to fraction form
    155.48/213.98 = 111.74/x
  3. Step 3: Cross multiply
    155.48x = 213.98 × 111.74
  4. Step 4: Simplify right side
    155.48x = 23,908.50
  5. Step 5: Solve for x
    x = 23,908.50/155.48
  6. Step 6: Final answer
    x = 153.78

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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.