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Finding the Fourth Proportional to 1,991.26, 2,986.90 and 623.26

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Solution

The fourth proportional to 1,991.26, 2,986.90 and 623.26 is: 934.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.26 : 2,986.90 = 623.26 : x
  2. Step 2: Convert to fraction form
    1,991.26/2,986.90 = 623.26/x
  3. Step 3: Cross multiply
    1,991.26x = 2,986.90 × 623.26
  4. Step 4: Simplify right side
    1,991.26x = 1,861,615.29
  5. Step 5: Solve for x
    x = 1,861,615.29/1,991.26
  6. Step 6: Final answer
    x = 934.89

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1.5x scale

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.