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Finding the Fourth Proportional to 1,911.31, 2,866.90 and 543.31

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Solution

The fourth proportional to 1,911.31, 2,866.90 and 543.31 is: 814.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.31 : 2,866.90 = 543.31 : x
  2. Step 2: Convert to fraction form
    1,911.31/2,866.90 = 543.31/x
  3. Step 3: Cross multiply
    1,911.31x = 2,866.90 × 543.31
  4. Step 4: Simplify right side
    1,911.31x = 1,557,615.44
  5. Step 5: Solve for x
    x = 1,557,615.44/1,911.31
  6. Step 6: Final answer
    x = 814.95

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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.