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Finding the Fourth Proportional to 1,120.34, 1,680.60 and 298.60

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Solution

The fourth proportional to 1,120.34, 1,680.60 and 298.60 is: 447.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.34 : 1,680.60 = 298.60 : x
  2. Step 2: Convert to fraction form
    1,120.34/1,680.60 = 298.60/x
  3. Step 3: Cross multiply
    1,120.34x = 1,680.60 × 298.60
  4. Step 4: Simplify right side
    1,120.34x = 501,827.16
  5. Step 5: Solve for x
    x = 501,827.16/1,120.34
  6. Step 6: Final answer
    x = 447.92

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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.