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Finding the Fourth Proportional to 1,089.88, 1,635.05 and 359.43

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Solution

The fourth proportional to 1,089.88, 1,635.05 and 359.43 is: 539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.88 : 1,635.05 = 359.43 : x
  2. Step 2: Convert to fraction form
    1,089.88/1,635.05 = 359.43/x
  3. Step 3: Cross multiply
    1,089.88x = 1,635.05 × 359.43
  4. Step 4: Simplify right side
    1,089.88x = 587,676.05
  5. Step 5: Solve for x
    x = 587,676.05/1,089.88
  6. Step 6: Final answer
    x = 539.21

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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.