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Finding the Fourth Proportional to 212.02, 291.34 and 189.70

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Solution

The fourth proportional to 212.02, 291.34 and 189.70 is: 260.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.02 : 291.34 = 189.70 : x
  2. Step 2: Convert to fraction form
    212.02/291.34 = 189.70/x
  3. Step 3: Cross multiply
    212.02x = 291.34 × 189.70
  4. Step 4: Simplify right side
    212.02x = 55,267.20
  5. Step 5: Solve for x
    x = 55,267.20/212.02
  6. Step 6: Final answer
    x = 260.67

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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.