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Finding the Fourth Proportional to 1,266.12, 1,899.29 and 388.55

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Solution

The fourth proportional to 1,266.12, 1,899.29 and 388.55 is: 582.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.12 : 1,899.29 = 388.55 : x
  2. Step 2: Convert to fraction form
    1,266.12/1,899.29 = 388.55/x
  3. Step 3: Cross multiply
    1,266.12x = 1,899.29 × 388.55
  4. Step 4: Simplify right side
    1,266.12x = 737,957.69
  5. Step 5: Solve for x
    x = 737,957.69/1,266.12
  6. Step 6: Final answer
    x = 582.85

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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.