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Finding the Fourth Proportional to 1,311, 1,966.74 and 581.20

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Solution

The fourth proportional to 1,311, 1,966.74 and 581.20 is: 871.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311 : 1,966.74 = 581.20 : x
  2. Step 2: Convert to fraction form
    1,311/1,966.74 = 581.20/x
  3. Step 3: Cross multiply
    1,311x = 1,966.74 × 581.20
  4. Step 4: Simplify right side
    1,311x = 1,143,069.29
  5. Step 5: Solve for x
    x = 1,143,069.29/1,311
  6. Step 6: Final answer
    x = 871.91

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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.