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Finding the Fourth Proportional to 553.76, 830.96 and 212

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Solution

The fourth proportional to 553.76, 830.96 and 212 is: 318.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.76 : 830.96 = 212 : x
  2. Step 2: Convert to fraction form
    553.76/830.96 = 212/x
  3. Step 3: Cross multiply
    553.76x = 830.96 × 212
  4. Step 4: Simplify right side
    553.76x = 176,163.52
  5. Step 5: Solve for x
    x = 176,163.52/553.76
  6. Step 6: Final answer
    x = 318.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.