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Finding the Fourth Proportional to 1,089.79, 1,634.88 and 359.39

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Solution

The fourth proportional to 1,089.79, 1,634.88 and 359.39 is: 539.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.79 : 1,634.88 = 359.39 : x
  2. Step 2: Convert to fraction form
    1,089.79/1,634.88 = 359.39/x
  3. Step 3: Cross multiply
    1,089.79x = 1,634.88 × 359.39
  4. Step 4: Simplify right side
    1,089.79x = 587,559.52
  5. Step 5: Solve for x
    x = 587,559.52/1,089.79
  6. Step 6: Final answer
    x = 539.15

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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.