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Finding the Fourth Proportional to 1,120.42, 1,680.81 and 379.96

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Solution

The fourth proportional to 1,120.42, 1,680.81 and 379.96 is: 570.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.42 : 1,680.81 = 379.96 : x
  2. Step 2: Convert to fraction form
    1,120.42/1,680.81 = 379.96/x
  3. Step 3: Cross multiply
    1,120.42x = 1,680.81 × 379.96
  4. Step 4: Simplify right side
    1,120.42x = 638,640.57
  5. Step 5: Solve for x
    x = 638,640.57/1,120.42
  6. Step 6: Final answer
    x = 570.00

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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.