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Finding the Fourth Proportional to 211.90, 292.47 and 149.84

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Solution

The fourth proportional to 211.90, 292.47 and 149.84 is: 206.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.90 : 292.47 = 149.84 : x
  2. Step 2: Convert to fraction form
    211.90/292.47 = 149.84/x
  3. Step 3: Cross multiply
    211.90x = 292.47 × 149.84
  4. Step 4: Simplify right side
    211.90x = 43,823.70
  5. Step 5: Solve for x
    x = 43,823.70/211.90
  6. Step 6: Final answer
    x = 206.81

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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.