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Finding the Fourth Proportional to 1,115.20, 1,674.24 and 703.20

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Solution

The fourth proportional to 1,115.20, 1,674.24 and 703.20 is: 1,055.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.20 : 1,674.24 = 703.20 : x
  2. Step 2: Convert to fraction form
    1,115.20/1,674.24 = 703.20/x
  3. Step 3: Cross multiply
    1,115.20x = 1,674.24 × 703.20
  4. Step 4: Simplify right side
    1,115.20x = 1,177,325.57
  5. Step 5: Solve for x
    x = 1,177,325.57/1,115.20
  6. Step 6: Final answer
    x = 1,055.71

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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.