Home / 1,021.21-1,531.91-290.89

Finding the Fourth Proportional to 1,021.21, 1,531.91 and 290.89

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Solution

The fourth proportional to 1,021.21, 1,531.91 and 290.89 is: 436.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.21 : 1,531.91 = 290.89 : x
  2. Step 2: Convert to fraction form
    1,021.21/1,531.91 = 290.89/x
  3. Step 3: Cross multiply
    1,021.21x = 1,531.91 × 290.89
  4. Step 4: Simplify right side
    1,021.21x = 445,619.94
  5. Step 5: Solve for x
    x = 445,619.94/1,021.21
  6. Step 6: Final answer
    x = 436.37

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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.