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Finding the Fourth Proportional to 1,268.99, 1,903.77 and 391.57

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Solution

The fourth proportional to 1,268.99, 1,903.77 and 391.57 is: 587.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.99 : 1,903.77 = 391.57 : x
  2. Step 2: Convert to fraction form
    1,268.99/1,903.77 = 391.57/x
  3. Step 3: Cross multiply
    1,268.99x = 1,903.77 × 391.57
  4. Step 4: Simplify right side
    1,268.99x = 745,459.22
  5. Step 5: Solve for x
    x = 745,459.22/1,268.99
  6. Step 6: Final answer
    x = 587.44

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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.