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Finding the Fourth Proportional to 155.03, 212.81 and 149.49

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Solution

The fourth proportional to 155.03, 212.81 and 149.49 is: 205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.03 : 212.81 = 149.49 : x
  2. Step 2: Convert to fraction form
    155.03/212.81 = 149.49/x
  3. Step 3: Cross multiply
    155.03x = 212.81 × 149.49
  4. Step 4: Simplify right side
    155.03x = 31,812.22
  5. Step 5: Solve for x
    x = 31,812.22/155.03
  6. Step 6: Final answer
    x = 205.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.