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Finding the Fourth Proportional to 149.98, 206.74 and 131.45

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Solution

The fourth proportional to 149.98, 206.74 and 131.45 is: 181.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.98 : 206.74 = 131.45 : x
  2. Step 2: Convert to fraction form
    149.98/206.74 = 131.45/x
  3. Step 3: Cross multiply
    149.98x = 206.74 × 131.45
  4. Step 4: Simplify right side
    149.98x = 27,175.50
  5. Step 5: Solve for x
    x = 27,175.50/149.98
  6. Step 6: Final answer
    x = 181.20

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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.