Home / 1,428.09-2,143.95-1,331.20

Finding the Fourth Proportional to 1,428.09, 2,143.95 and 1,331.20

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Solution

The fourth proportional to 1,428.09, 2,143.95 and 1,331.20 is: 1,998.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.09 : 2,143.95 = 1,331.20 : x
  2. Step 2: Convert to fraction form
    1,428.09/2,143.95 = 1,331.20/x
  3. Step 3: Cross multiply
    1,428.09x = 2,143.95 × 1,331.20
  4. Step 4: Simplify right side
    1,428.09x = 2,854,026.24
  5. Step 5: Solve for x
    x = 2,854,026.24/1,428.09
  6. Step 6: Final answer
    x = 1,998.49

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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.