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Finding the Fourth Proportional to 211.70, 291.78 and 146.09

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Solution

The fourth proportional to 211.70, 291.78 and 146.09 is: 201.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.70 : 291.78 = 146.09 : x
  2. Step 2: Convert to fraction form
    211.70/291.78 = 146.09/x
  3. Step 3: Cross multiply
    211.70x = 291.78 × 146.09
  4. Step 4: Simplify right side
    211.70x = 42,624.68
  5. Step 5: Solve for x
    x = 42,624.68/211.70
  6. Step 6: Final answer
    x = 201.35

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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.