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Finding the Fourth Proportional to 2,489.60, 3,734.40 and 1,619.20

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Solution

The fourth proportional to 2,489.60, 3,734.40 and 1,619.20 is: 2,428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.60 : 3,734.40 = 1,619.20 : x
  2. Step 2: Convert to fraction form
    2,489.60/3,734.40 = 1,619.20/x
  3. Step 3: Cross multiply
    2,489.60x = 3,734.40 × 1,619.20
  4. Step 4: Simplify right side
    2,489.60x = 6,046,740.48
  5. Step 5: Solve for x
    x = 6,046,740.48/2,489.60
  6. Step 6: Final answer
    x = 2,428.80

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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.