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Finding the Fourth Proportional to 1,112.36, 1,668.59 and 290.65

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Solution

The fourth proportional to 1,112.36, 1,668.59 and 290.65 is: 435.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.36 : 1,668.59 = 290.65 : x
  2. Step 2: Convert to fraction form
    1,112.36/1,668.59 = 290.65/x
  3. Step 3: Cross multiply
    1,112.36x = 1,668.59 × 290.65
  4. Step 4: Simplify right side
    1,112.36x = 484,965.89
  5. Step 5: Solve for x
    x = 484,965.89/1,112.36
  6. Step 6: Final answer
    x = 435.98

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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.