Home / 1,535.15-2,118.31-905.54

Finding the Fourth Proportional to 1,535.15, 2,118.31 and 905.54

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Solution

The fourth proportional to 1,535.15, 2,118.31 and 905.54 is: 1,249.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535.15 : 2,118.31 = 905.54 : x
  2. Step 2: Convert to fraction form
    1,535.15/2,118.31 = 905.54/x
  3. Step 3: Cross multiply
    1,535.15x = 2,118.31 × 905.54
  4. Step 4: Simplify right side
    1,535.15x = 1,918,214.44
  5. Step 5: Solve for x
    x = 1,918,214.44/1,535.15
  6. Step 6: Final answer
    x = 1,249.53

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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.