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Finding the Fourth Proportional to 1,291.82, 1,939.02 and 561.90

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Solution

The fourth proportional to 1,291.82, 1,939.02 and 561.90 is: 843.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.82 : 1,939.02 = 561.90 : x
  2. Step 2: Convert to fraction form
    1,291.82/1,939.02 = 561.90/x
  3. Step 3: Cross multiply
    1,291.82x = 1,939.02 × 561.90
  4. Step 4: Simplify right side
    1,291.82x = 1,089,532.53
  5. Step 5: Solve for x
    x = 1,089,532.53/1,291.82
  6. Step 6: Final answer
    x = 843.41

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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.