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Finding the Fourth Proportional to 1,991.78, 2,987.40 and 531.04

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Solution

The fourth proportional to 1,991.78, 2,987.40 and 531.04 is: 796.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.78 : 2,987.40 = 531.04 : x
  2. Step 2: Convert to fraction form
    1,991.78/2,987.40 = 531.04/x
  3. Step 3: Cross multiply
    1,991.78x = 2,987.40 × 531.04
  4. Step 4: Simplify right side
    1,991.78x = 1,586,428.90
  5. Step 5: Solve for x
    x = 1,586,428.90/1,991.78
  6. Step 6: Final answer
    x = 796.49

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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.