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Finding the Fourth Proportional to 1,120.68, 1,680.80 and 298.85

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Solution

The fourth proportional to 1,120.68, 1,680.80 and 298.85 is: 448.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.68 : 1,680.80 = 298.85 : x
  2. Step 2: Convert to fraction form
    1,120.68/1,680.80 = 298.85/x
  3. Step 3: Cross multiply
    1,120.68x = 1,680.80 × 298.85
  4. Step 4: Simplify right side
    1,120.68x = 502,297.18
  5. Step 5: Solve for x
    x = 502,297.18/1,120.68
  6. Step 6: Final answer
    x = 448.21

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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.