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Finding the Fourth Proportional to 3,457.26, 5,185.95 and 860.21

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Solution

The fourth proportional to 3,457.26, 5,185.95 and 860.21 is: 1,290.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,457.26 : 5,185.95 = 860.21 : x
  2. Step 2: Convert to fraction form
    3,457.26/5,185.95 = 860.21/x
  3. Step 3: Cross multiply
    3,457.26x = 5,185.95 × 860.21
  4. Step 4: Simplify right side
    3,457.26x = 4,460,980.12
  5. Step 5: Solve for x
    x = 4,460,980.12/3,457.26
  6. Step 6: Final answer
    x = 1,290.32

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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.