Home / 1,112.15-1,668.20-290.40

Finding the Fourth Proportional to 1,112.15, 1,668.20 and 290.40

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Solution

The fourth proportional to 1,112.15, 1,668.20 and 290.40 is: 435.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.15 : 1,668.20 = 290.40 : x
  2. Step 2: Convert to fraction form
    1,112.15/1,668.20 = 290.40/x
  3. Step 3: Cross multiply
    1,112.15x = 1,668.20 × 290.40
  4. Step 4: Simplify right side
    1,112.15x = 484,443.83
  5. Step 5: Solve for x
    x = 484,443.83/1,112.15
  6. Step 6: Final answer
    x = 435.59

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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.