Home / 1,428.18-2,143.77-813.09

Finding the Fourth Proportional to 1,428.18, 2,143.77 and 813.09

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Solution

The fourth proportional to 1,428.18, 2,143.77 and 813.09 is: 1,220.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.18 : 2,143.77 = 813.09 : x
  2. Step 2: Convert to fraction form
    1,428.18/2,143.77 = 813.09/x
  3. Step 3: Cross multiply
    1,428.18x = 2,143.77 × 813.09
  4. Step 4: Simplify right side
    1,428.18x = 1,743,077.95
  5. Step 5: Solve for x
    x = 1,743,077.95/1,428.18
  6. Step 6: Final answer
    x = 1,220.49

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1.5x scale

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.