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Finding the Fourth Proportional to 3,457.21, 5,184.75 and 991.37

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Solution

The fourth proportional to 3,457.21, 5,184.75 and 991.37 is: 1,486.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,457.21 : 5,184.75 = 991.37 : x
  2. Step 2: Convert to fraction form
    3,457.21/5,184.75 = 991.37/x
  3. Step 3: Cross multiply
    3,457.21x = 5,184.75 × 991.37
  4. Step 4: Simplify right side
    3,457.21x = 5,140,005.61
  5. Step 5: Solve for x
    x = 5,140,005.61/3,457.21
  6. Step 6: Final answer
    x = 1,486.75

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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.