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Finding the Fourth Proportional to 2,157.50, 3,236.22 and 770.87

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Solution

The fourth proportional to 2,157.50, 3,236.22 and 770.87 is: 1,156.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.50 : 3,236.22 = 770.87 : x
  2. Step 2: Convert to fraction form
    2,157.50/3,236.22 = 770.87/x
  3. Step 3: Cross multiply
    2,157.50x = 3,236.22 × 770.87
  4. Step 4: Simplify right side
    2,157.50x = 2,494,713.00
  5. Step 5: Solve for x
    x = 2,494,713.00/2,157.50
  6. Step 6: Final answer
    x = 1,156.30

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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.