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Finding the Fourth Proportional to 1,000.56, 1,378.21 and 843.02

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Solution

The fourth proportional to 1,000.56, 1,378.21 and 843.02 is: 1,161.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.56 : 1,378.21 = 843.02 : x
  2. Step 2: Convert to fraction form
    1,000.56/1,378.21 = 843.02/x
  3. Step 3: Cross multiply
    1,000.56x = 1,378.21 × 843.02
  4. Step 4: Simplify right side
    1,000.56x = 1,161,858.59
  5. Step 5: Solve for x
    x = 1,161,858.59/1,000.56
  6. Step 6: Final answer
    x = 1,161.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.