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Finding the Fourth Proportional to 1,266.18, 1,899 and 388.49

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Solution

The fourth proportional to 1,266.18, 1,899 and 388.49 is: 582.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.18 : 1,899 = 388.49 : x
  2. Step 2: Convert to fraction form
    1,266.18/1,899 = 388.49/x
  3. Step 3: Cross multiply
    1,266.18x = 1,899 × 388.49
  4. Step 4: Simplify right side
    1,266.18x = 737,733.02
  5. Step 5: Solve for x
    x = 737,733.02/1,266.18
  6. Step 6: Final answer
    x = 582.64

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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.