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Finding the Fourth Proportional to 1,238.19, 1,858.94 and 718.57

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Solution

The fourth proportional to 1,238.19, 1,858.94 and 718.57 is: 1,078.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.19 : 1,858.94 = 718.57 : x
  2. Step 2: Convert to fraction form
    1,238.19/1,858.94 = 718.57/x
  3. Step 3: Cross multiply
    1,238.19x = 1,858.94 × 718.57
  4. Step 4: Simplify right side
    1,238.19x = 1,335,777.93
  5. Step 5: Solve for x
    x = 1,335,777.93/1,238.19
  6. Step 6: Final answer
    x = 1,078.81

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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.