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Finding the Fourth Proportional to 1,089.61, 1,634.45 and 359.17

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Solution

The fourth proportional to 1,089.61, 1,634.45 and 359.17 is: 538.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.61 : 1,634.45 = 359.17 : x
  2. Step 2: Convert to fraction form
    1,089.61/1,634.45 = 359.17/x
  3. Step 3: Cross multiply
    1,089.61x = 1,634.45 × 359.17
  4. Step 4: Simplify right side
    1,089.61x = 587,039.52
  5. Step 5: Solve for x
    x = 587,039.52/1,089.61
  6. Step 6: Final answer
    x = 538.76

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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.