Home / 1,420.50-2,131.11-543.36

Finding the Fourth Proportional to 1,420.50, 2,131.11 and 543.36

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Solution

The fourth proportional to 1,420.50, 2,131.11 and 543.36 is: 815.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.50 : 2,131.11 = 543.36 : x
  2. Step 2: Convert to fraction form
    1,420.50/2,131.11 = 543.36/x
  3. Step 3: Cross multiply
    1,420.50x = 2,131.11 × 543.36
  4. Step 4: Simplify right side
    1,420.50x = 1,157,959.93
  5. Step 5: Solve for x
    x = 1,157,959.93/1,420.50
  6. Step 6: Final answer
    x = 815.18

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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.