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Finding the Fourth Proportional to 553.87, 830.32 and 211.63

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Solution

The fourth proportional to 553.87, 830.32 and 211.63 is: 317.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.87 : 830.32 = 211.63 : x
  2. Step 2: Convert to fraction form
    553.87/830.32 = 211.63/x
  3. Step 3: Cross multiply
    553.87x = 830.32 × 211.63
  4. Step 4: Simplify right side
    553.87x = 175,715.94
  5. Step 5: Solve for x
    x = 175,715.94/553.87
  6. Step 6: Final answer
    x = 317.25

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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.