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Finding the Fourth Proportional to 1,311, 1,966.36 and 386.56

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Solution

The fourth proportional to 1,311, 1,966.36 and 386.56 is: 579.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311 : 1,966.36 = 386.56 : x
  2. Step 2: Convert to fraction form
    1,311/1,966.36 = 386.56/x
  3. Step 3: Cross multiply
    1,311x = 1,966.36 × 386.56
  4. Step 4: Simplify right side
    1,311x = 760,116.12
  5. Step 5: Solve for x
    x = 760,116.12/1,311
  6. Step 6: Final answer
    x = 579.80

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Double scale
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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.