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Finding the Fourth Proportional to 1,211.76, 1,817.95 and 471.14

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Solution

The fourth proportional to 1,211.76, 1,817.95 and 471.14 is: 706.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.76 : 1,817.95 = 471.14 : x
  2. Step 2: Convert to fraction form
    1,211.76/1,817.95 = 471.14/x
  3. Step 3: Cross multiply
    1,211.76x = 1,817.95 × 471.14
  4. Step 4: Simplify right side
    1,211.76x = 856,508.96
  5. Step 5: Solve for x
    x = 856,508.96/1,211.76
  6. Step 6: Final answer
    x = 706.83

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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.