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Finding the Fourth Proportional to 891.84, 1,336.20 and 618.11

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Solution

The fourth proportional to 891.84, 1,336.20 and 618.11 is: 926.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.84 : 1,336.20 = 618.11 : x
  2. Step 2: Convert to fraction form
    891.84/1,336.20 = 618.11/x
  3. Step 3: Cross multiply
    891.84x = 1,336.20 × 618.11
  4. Step 4: Simplify right side
    891.84x = 825,910.84
  5. Step 5: Solve for x
    x = 825,910.84/891.84
  6. Step 6: Final answer
    x = 926.08

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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.