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Finding the Fourth Proportional to 891.86, 1,231.06 and 518.96

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Solution

The fourth proportional to 891.86, 1,231.06 and 518.96 is: 716.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.86 : 1,231.06 = 518.96 : x
  2. Step 2: Convert to fraction form
    891.86/1,231.06 = 518.96/x
  3. Step 3: Cross multiply
    891.86x = 1,231.06 × 518.96
  4. Step 4: Simplify right side
    891.86x = 638,870.90
  5. Step 5: Solve for x
    x = 638,870.90/891.86
  6. Step 6: Final answer
    x = 716.34

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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.