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Finding the Fourth Proportional to 1,211.87, 1,817.60 and 553.55

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Solution

The fourth proportional to 1,211.87, 1,817.60 and 553.55 is: 830.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.87 : 1,817.60 = 553.55 : x
  2. Step 2: Convert to fraction form
    1,211.87/1,817.60 = 553.55/x
  3. Step 3: Cross multiply
    1,211.87x = 1,817.60 × 553.55
  4. Step 4: Simplify right side
    1,211.87x = 1,006,120.62
  5. Step 5: Solve for x
    x = 1,006,120.62/1,211.87
  6. Step 6: Final answer
    x = 830.22

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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.