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Finding the Fourth Proportional to 212.12, 292.87 and 153.21

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Solution

The fourth proportional to 212.12, 292.87 and 153.21 is: 211.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.12 : 292.87 = 153.21 : x
  2. Step 2: Convert to fraction form
    212.12/292.87 = 153.21/x
  3. Step 3: Cross multiply
    212.12x = 292.87 × 153.21
  4. Step 4: Simplify right side
    212.12x = 44,869.39
  5. Step 5: Solve for x
    x = 44,869.39/212.12
  6. Step 6: Final answer
    x = 211.53

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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.