Home / 1,420.25-2,130.29-680.39

Finding the Fourth Proportional to 1,420.25, 2,130.29 and 680.39

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Solution

The fourth proportional to 1,420.25, 2,130.29 and 680.39 is: 1,020.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.25 : 2,130.29 = 680.39 : x
  2. Step 2: Convert to fraction form
    1,420.25/2,130.29 = 680.39/x
  3. Step 3: Cross multiply
    1,420.25x = 2,130.29 × 680.39
  4. Step 4: Simplify right side
    1,420.25x = 1,449,424.50
  5. Step 5: Solve for x
    x = 1,449,424.50/1,420.25
  6. Step 6: Final answer
    x = 1,020.54

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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.