Home / 1,555.09-2,145.85-856.33

Finding the Fourth Proportional to 1,555.09, 2,145.85 and 856.33

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Solution

The fourth proportional to 1,555.09, 2,145.85 and 856.33 is: 1,181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.09 : 2,145.85 = 856.33 : x
  2. Step 2: Convert to fraction form
    1,555.09/2,145.85 = 856.33/x
  3. Step 3: Cross multiply
    1,555.09x = 2,145.85 × 856.33
  4. Step 4: Simplify right side
    1,555.09x = 1,837,555.73
  5. Step 5: Solve for x
    x = 1,837,555.73/1,555.09
  6. Step 6: Final answer
    x = 1,181.64

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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.