Home / 2,157.30-3,236.22-858.78

Finding the Fourth Proportional to 2,157.30, 3,236.22 and 858.78

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Solution

The fourth proportional to 2,157.30, 3,236.22 and 858.78 is: 1,288.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.30 : 3,236.22 = 858.78 : x
  2. Step 2: Convert to fraction form
    2,157.30/3,236.22 = 858.78/x
  3. Step 3: Cross multiply
    2,157.30x = 3,236.22 × 858.78
  4. Step 4: Simplify right side
    2,157.30x = 2,779,201.01
  5. Step 5: Solve for x
    x = 2,779,201.01/2,157.30
  6. Step 6: Final answer
    x = 1,288.28

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1.5x scale

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.