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Finding the Fourth Proportional to 1,265.92, 1,899.12 and 388.48

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Solution

The fourth proportional to 1,265.92, 1,899.12 and 388.48 is: 582.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.92 : 1,899.12 = 388.48 : x
  2. Step 2: Convert to fraction form
    1,265.92/1,899.12 = 388.48/x
  3. Step 3: Cross multiply
    1,265.92x = 1,899.12 × 388.48
  4. Step 4: Simplify right side
    1,265.92x = 737,770.14
  5. Step 5: Solve for x
    x = 737,770.14/1,265.92
  6. Step 6: Final answer
    x = 582.79

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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.