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Finding the Fourth Proportional to 789.18, 1,088.64 and 494.39

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Solution

The fourth proportional to 789.18, 1,088.64 and 494.39 is: 681.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.18 : 1,088.64 = 494.39 : x
  2. Step 2: Convert to fraction form
    789.18/1,088.64 = 494.39/x
  3. Step 3: Cross multiply
    789.18x = 1,088.64 × 494.39
  4. Step 4: Simplify right side
    789.18x = 538,212.73
  5. Step 5: Solve for x
    x = 538,212.73/789.18
  6. Step 6: Final answer
    x = 681.99

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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.