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Finding the Fourth Proportional to 2,157.12, 3,236.40 and 858.24

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Solution

The fourth proportional to 2,157.12, 3,236.40 and 858.24 is: 1,287.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.12 : 3,236.40 = 858.24 : x
  2. Step 2: Convert to fraction form
    2,157.12/3,236.40 = 858.24/x
  3. Step 3: Cross multiply
    2,157.12x = 3,236.40 × 858.24
  4. Step 4: Simplify right side
    2,157.12x = 2,777,607.94
  5. Step 5: Solve for x
    x = 2,777,607.94/2,157.12
  6. Step 6: Final answer
    x = 1,287.65

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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.