Home / 1,408.10-2,111.85-628.10

Finding the Fourth Proportional to 1,408.10, 2,111.85 and 628.10

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Solution

The fourth proportional to 1,408.10, 2,111.85 and 628.10 is: 942.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.10 : 2,111.85 = 628.10 : x
  2. Step 2: Convert to fraction form
    1,408.10/2,111.85 = 628.10/x
  3. Step 3: Cross multiply
    1,408.10x = 2,111.85 × 628.10
  4. Step 4: Simplify right side
    1,408.10x = 1,326,452.99
  5. Step 5: Solve for x
    x = 1,326,452.99/1,408.10
  6. Step 6: Final answer
    x = 942.02

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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.