Home / 1,424.28-2,137.20-990.60

Finding the Fourth Proportional to 1,424.28, 2,137.20 and 990.60

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Solution

The fourth proportional to 1,424.28, 2,137.20 and 990.60 is: 1,486.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.28 : 2,137.20 = 990.60 : x
  2. Step 2: Convert to fraction form
    1,424.28/2,137.20 = 990.60/x
  3. Step 3: Cross multiply
    1,424.28x = 2,137.20 × 990.60
  4. Step 4: Simplify right side
    1,424.28x = 2,117,110.32
  5. Step 5: Solve for x
    x = 2,117,110.32/1,424.28
  6. Step 6: Final answer
    x = 1,486.44

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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.