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Finding the Fourth Proportional to 891.06, 1,335.78 and 505.50

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Solution

The fourth proportional to 891.06, 1,335.78 and 505.50 is: 757.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.06 : 1,335.78 = 505.50 : x
  2. Step 2: Convert to fraction form
    891.06/1,335.78 = 505.50/x
  3. Step 3: Cross multiply
    891.06x = 1,335.78 × 505.50
  4. Step 4: Simplify right side
    891.06x = 675,236.79
  5. Step 5: Solve for x
    x = 675,236.79/891.06
  6. Step 6: Final answer
    x = 757.79

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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.