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Finding the Fourth Proportional to 891.39, 1,336.62 and 480.11

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Solution

The fourth proportional to 891.39, 1,336.62 and 480.11 is: 719.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.39 : 1,336.62 = 480.11 : x
  2. Step 2: Convert to fraction form
    891.39/1,336.62 = 480.11/x
  3. Step 3: Cross multiply
    891.39x = 1,336.62 × 480.11
  4. Step 4: Simplify right side
    891.39x = 641,717.95
  5. Step 5: Solve for x
    x = 641,717.95/891.39
  6. Step 6: Final answer
    x = 719.91

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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.