Home / 2,115.18-2,919.96-1,408.20

Finding the Fourth Proportional to 2,115.18, 2,919.96 and 1,408.20

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Solution

The fourth proportional to 2,115.18, 2,919.96 and 1,408.20 is: 1,943.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.18 : 2,919.96 = 1,408.20 : x
  2. Step 2: Convert to fraction form
    2,115.18/2,919.96 = 1,408.20/x
  3. Step 3: Cross multiply
    2,115.18x = 2,919.96 × 1,408.20
  4. Step 4: Simplify right side
    2,115.18x = 4,111,887.67
  5. Step 5: Solve for x
    x = 4,111,887.67/2,115.18
  6. Step 6: Final answer
    x = 1,943.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.