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Finding the Fourth Proportional to 1,120.75, 1,680.98 and 299.08

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Solution

The fourth proportional to 1,120.75, 1,680.98 and 299.08 is: 448.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.75 : 1,680.98 = 299.08 : x
  2. Step 2: Convert to fraction form
    1,120.75/1,680.98 = 299.08/x
  3. Step 3: Cross multiply
    1,120.75x = 1,680.98 × 299.08
  4. Step 4: Simplify right side
    1,120.75x = 502,744.04
  5. Step 5: Solve for x
    x = 502,744.04/1,120.75
  6. Step 6: Final answer
    x = 448.58

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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.