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Finding the Fourth Proportional to 1,143.56, 1,713.42 and 629

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Solution

The fourth proportional to 1,143.56, 1,713.42 and 629 is: 942.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.56 : 1,713.42 = 629 : x
  2. Step 2: Convert to fraction form
    1,143.56/1,713.42 = 629/x
  3. Step 3: Cross multiply
    1,143.56x = 1,713.42 × 629
  4. Step 4: Simplify right side
    1,143.56x = 1,077,741.18
  5. Step 5: Solve for x
    x = 1,077,741.18/1,143.56
  6. Step 6: Final answer
    x = 942.44

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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.