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Finding the Fourth Proportional to 1,211.31, 1,817.57 and 561.93

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Solution

The fourth proportional to 1,211.31, 1,817.57 and 561.93 is: 843.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.31 : 1,817.57 = 561.93 : x
  2. Step 2: Convert to fraction form
    1,211.31/1,817.57 = 561.93/x
  3. Step 3: Cross multiply
    1,211.31x = 1,817.57 × 561.93
  4. Step 4: Simplify right side
    1,211.31x = 1,021,344.30
  5. Step 5: Solve for x
    x = 1,021,344.30/1,211.31
  6. Step 6: Final answer
    x = 843.17

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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.