Home / 1,421.26-2,131.57-543.46

Finding the Fourth Proportional to 1,421.26, 2,131.57 and 543.46

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Solution

The fourth proportional to 1,421.26, 2,131.57 and 543.46 is: 815.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.26 : 2,131.57 = 543.46 : x
  2. Step 2: Convert to fraction form
    1,421.26/2,131.57 = 543.46/x
  3. Step 3: Cross multiply
    1,421.26x = 2,131.57 × 543.46
  4. Step 4: Simplify right side
    1,421.26x = 1,158,423.03
  5. Step 5: Solve for x
    x = 1,158,423.03/1,421.26
  6. Step 6: Final answer
    x = 815.07

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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.