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Finding the Fourth Proportional to 891.54, 1,230.39 and 518.55

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Solution

The fourth proportional to 891.54, 1,230.39 and 518.55 is: 715.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.54 : 1,230.39 = 518.55 : x
  2. Step 2: Convert to fraction form
    891.54/1,230.39 = 518.55/x
  3. Step 3: Cross multiply
    891.54x = 1,230.39 × 518.55
  4. Step 4: Simplify right side
    891.54x = 638,018.73
  5. Step 5: Solve for x
    x = 638,018.73/891.54
  6. Step 6: Final answer
    x = 715.64

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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.