Home / 1,021.12-1,531.67-290.70

Finding the Fourth Proportional to 1,021.12, 1,531.67 and 290.70

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Solution

The fourth proportional to 1,021.12, 1,531.67 and 290.70 is: 436.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.12 : 1,531.67 = 290.70 : x
  2. Step 2: Convert to fraction form
    1,021.12/1,531.67 = 290.70/x
  3. Step 3: Cross multiply
    1,021.12x = 1,531.67 × 290.70
  4. Step 4: Simplify right side
    1,021.12x = 445,255.02
  5. Step 5: Solve for x
    x = 445,255.02/1,021.12
  6. Step 6: Final answer
    x = 436.05

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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.