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Finding the Fourth Proportional to 1,120.95, 1,679.84 and 955.56

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Solution

The fourth proportional to 1,120.95, 1,679.84 and 955.56 is: 1,431.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.95 : 1,679.84 = 955.56 : x
  2. Step 2: Convert to fraction form
    1,120.95/1,679.84 = 955.56/x
  3. Step 3: Cross multiply
    1,120.95x = 1,679.84 × 955.56
  4. Step 4: Simplify right side
    1,120.95x = 1,605,183.13
  5. Step 5: Solve for x
    x = 1,605,183.13/1,120.95
  6. Step 6: Final answer
    x = 1,431.98

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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.