Home / 1,428.38-2,140.37-990.49

Finding the Fourth Proportional to 1,428.38, 2,140.37 and 990.49

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Solution

The fourth proportional to 1,428.38, 2,140.37 and 990.49 is: 1,484.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.38 : 2,140.37 = 990.49 : x
  2. Step 2: Convert to fraction form
    1,428.38/2,140.37 = 990.49/x
  3. Step 3: Cross multiply
    1,428.38x = 2,140.37 × 990.49
  4. Step 4: Simplify right side
    1,428.38x = 2,120,012.80
  5. Step 5: Solve for x
    x = 2,120,012.80/1,428.38
  6. Step 6: Final answer
    x = 1,484.21

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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.