Home / 3,128.96-4,692.36-1,280

Finding the Fourth Proportional to 3,128.96, 4,692.36 and 1,280

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Solution

The fourth proportional to 3,128.96, 4,692.36 and 1,280 is: 1,919.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.96 : 4,692.36 = 1,280 : x
  2. Step 2: Convert to fraction form
    3,128.96/4,692.36 = 1,280/x
  3. Step 3: Cross multiply
    3,128.96x = 4,692.36 × 1,280
  4. Step 4: Simplify right side
    3,128.96x = 6,006,220.80
  5. Step 5: Solve for x
    x = 6,006,220.80/3,128.96
  6. Step 6: Final answer
    x = 1,919.56

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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.