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Finding the Fourth Proportional to 1,266.44, 1,899.65 and 388.94

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Solution

The fourth proportional to 1,266.44, 1,899.65 and 388.94 is: 583.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.44 : 1,899.65 = 388.94 : x
  2. Step 2: Convert to fraction form
    1,266.44/1,899.65 = 388.94/x
  3. Step 3: Cross multiply
    1,266.44x = 1,899.65 × 388.94
  4. Step 4: Simplify right side
    1,266.44x = 738,838.43
  5. Step 5: Solve for x
    x = 738,838.43/1,266.44
  6. Step 6: Final answer
    x = 583.40

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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.