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Finding the Fourth Proportional to 1,089.50, 1,634.25 and 320

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Solution

The fourth proportional to 1,089.50, 1,634.25 and 320 is: 480

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.50 : 1,634.25 = 320 : x
  2. Step 2: Convert to fraction form
    1,089.50/1,634.25 = 320/x
  3. Step 3: Cross multiply
    1,089.50x = 1,634.25 × 320
  4. Step 4: Simplify right side
    1,089.50x = 522,960
  5. Step 5: Solve for x
    x = 522,960/1,089.50
  6. Step 6: Final answer
    x = 480

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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.