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Finding the Fourth Proportional to 1,311.37, 1,968.42 and 581.45

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Solution

The fourth proportional to 1,311.37, 1,968.42 and 581.45 is: 872.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.37 : 1,968.42 = 581.45 : x
  2. Step 2: Convert to fraction form
    1,311.37/1,968.42 = 581.45/x
  3. Step 3: Cross multiply
    1,311.37x = 1,968.42 × 581.45
  4. Step 4: Simplify right side
    1,311.37x = 1,144,537.81
  5. Step 5: Solve for x
    x = 1,144,537.81/1,311.37
  6. Step 6: Final answer
    x = 872.78

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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.