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Finding the Fourth Proportional to 212.70, 291.65 and 191.90

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Solution

The fourth proportional to 212.70, 291.65 and 191.90 is: 263.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.70 : 291.65 = 191.90 : x
  2. Step 2: Convert to fraction form
    212.70/291.65 = 191.90/x
  3. Step 3: Cross multiply
    212.70x = 291.65 × 191.90
  4. Step 4: Simplify right side
    212.70x = 55,965.22
  5. Step 5: Solve for x
    x = 55,965.22/212.70
  6. Step 6: Final answer
    x = 263.12

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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.