Home / 1,021.29-1,531.47-290.69

Finding the Fourth Proportional to 1,021.29, 1,531.47 and 290.69

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Solution

The fourth proportional to 1,021.29, 1,531.47 and 290.69 is: 435.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.29 : 1,531.47 = 290.69 : x
  2. Step 2: Convert to fraction form
    1,021.29/1,531.47 = 290.69/x
  3. Step 3: Cross multiply
    1,021.29x = 1,531.47 × 290.69
  4. Step 4: Simplify right side
    1,021.29x = 445,183.01
  5. Step 5: Solve for x
    x = 445,183.01/1,021.29
  6. Step 6: Final answer
    x = 435.90

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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.