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Finding the Fourth Proportional to 698.67, 964.55 and 489.49

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Solution

The fourth proportional to 698.67, 964.55 and 489.49 is: 675.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.67 : 964.55 = 489.49 : x
  2. Step 2: Convert to fraction form
    698.67/964.55 = 489.49/x
  3. Step 3: Cross multiply
    698.67x = 964.55 × 489.49
  4. Step 4: Simplify right side
    698.67x = 472,137.58
  5. Step 5: Solve for x
    x = 472,137.58/698.67
  6. Step 6: Final answer
    x = 675.76

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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.