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Finding the Fourth Proportional to 1,268.64, 1,903.77 and 489.27

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Solution

The fourth proportional to 1,268.64, 1,903.77 and 489.27 is: 734.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.64 : 1,903.77 = 489.27 : x
  2. Step 2: Convert to fraction form
    1,268.64/1,903.77 = 489.27/x
  3. Step 3: Cross multiply
    1,268.64x = 1,903.77 × 489.27
  4. Step 4: Simplify right side
    1,268.64x = 931,457.55
  5. Step 5: Solve for x
    x = 931,457.55/1,268.64
  6. Step 6: Final answer
    x = 734.22

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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.