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Finding the Fourth Proportional to 891.57, 1,228.86 and 611.31

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Solution

The fourth proportional to 891.57, 1,228.86 and 611.31 is: 842.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.57 : 1,228.86 = 611.31 : x
  2. Step 2: Convert to fraction form
    891.57/1,228.86 = 611.31/x
  3. Step 3: Cross multiply
    891.57x = 1,228.86 × 611.31
  4. Step 4: Simplify right side
    891.57x = 751,214.41
  5. Step 5: Solve for x
    x = 751,214.41/891.57
  6. Step 6: Final answer
    x = 842.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.