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Finding the Fourth Proportional to 1,407.98, 2,112.60 and 758.82

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Solution

The fourth proportional to 1,407.98, 2,112.60 and 758.82 is: 1,138.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.98 : 2,112.60 = 758.82 : x
  2. Step 2: Convert to fraction form
    1,407.98/2,112.60 = 758.82/x
  3. Step 3: Cross multiply
    1,407.98x = 2,112.60 × 758.82
  4. Step 4: Simplify right side
    1,407.98x = 1,603,083.13
  5. Step 5: Solve for x
    x = 1,603,083.13/1,407.98
  6. Step 6: Final answer
    x = 1,138.57

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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.