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Finding the Fourth Proportional to 1,268.52, 1,903.58 and 499

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Solution

The fourth proportional to 1,268.52, 1,903.58 and 499 is: 748.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.52 : 1,903.58 = 499 : x
  2. Step 2: Convert to fraction form
    1,268.52/1,903.58 = 499/x
  3. Step 3: Cross multiply
    1,268.52x = 1,903.58 × 499
  4. Step 4: Simplify right side
    1,268.52x = 949,886.42
  5. Step 5: Solve for x
    x = 949,886.42/1,268.52
  6. Step 6: Final answer
    x = 748.81

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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.