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Finding the Fourth Proportional to 891.12, 1,335.78 and 505.56

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Solution

The fourth proportional to 891.12, 1,335.78 and 505.56 is: 757.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.12 : 1,335.78 = 505.56 : x
  2. Step 2: Convert to fraction form
    891.12/1,335.78 = 505.56/x
  3. Step 3: Cross multiply
    891.12x = 1,335.78 × 505.56
  4. Step 4: Simplify right side
    891.12x = 675,316.94
  5. Step 5: Solve for x
    x = 675,316.94/891.12
  6. Step 6: Final answer
    x = 757.83

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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.