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Finding the Fourth Proportional to 2,187.12, 3,278.48 and 955.20

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Solution

The fourth proportional to 2,187.12, 3,278.48 and 955.20 is: 1,431.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.12 : 3,278.48 = 955.20 : x
  2. Step 2: Convert to fraction form
    2,187.12/3,278.48 = 955.20/x
  3. Step 3: Cross multiply
    2,187.12x = 3,278.48 × 955.20
  4. Step 4: Simplify right side
    2,187.12x = 3,131,604.10
  5. Step 5: Solve for x
    x = 3,131,604.10/2,187.12
  6. Step 6: Final answer
    x = 1,431.84

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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.