Home / 3,136.80-4,328.78-1,720.50

Finding the Fourth Proportional to 3,136.80, 4,328.78 and 1,720.50

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Solution

The fourth proportional to 3,136.80, 4,328.78 and 1,720.50 is: 2,374.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,136.80 : 4,328.78 = 1,720.50 : x
  2. Step 2: Convert to fraction form
    3,136.80/4,328.78 = 1,720.50/x
  3. Step 3: Cross multiply
    3,136.80x = 4,328.78 × 1,720.50
  4. Step 4: Simplify right side
    3,136.80x = 7,447,665.99
  5. Step 5: Solve for x
    x = 7,447,665.99/3,136.80
  6. Step 6: Final answer
    x = 2,374.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.