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Finding the Fourth Proportional to 1,408.75, 2,112.04 and 853.34

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Solution

The fourth proportional to 1,408.75, 2,112.04 and 853.34 is: 1,279.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.75 : 2,112.04 = 853.34 : x
  2. Step 2: Convert to fraction form
    1,408.75/2,112.04 = 853.34/x
  3. Step 3: Cross multiply
    1,408.75x = 2,112.04 × 853.34
  4. Step 4: Simplify right side
    1,408.75x = 1,802,288.21
  5. Step 5: Solve for x
    x = 1,802,288.21/1,408.75
  6. Step 6: Final answer
    x = 1,279.35

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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.