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Finding the Fourth Proportional to 699.21, 965.28 and 489.56

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Solution

The fourth proportional to 699.21, 965.28 and 489.56 is: 675.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.21 : 965.28 = 489.56 : x
  2. Step 2: Convert to fraction form
    699.21/965.28 = 489.56/x
  3. Step 3: Cross multiply
    699.21x = 965.28 × 489.56
  4. Step 4: Simplify right side
    699.21x = 472,557.65
  5. Step 5: Solve for x
    x = 472,557.65/699.21
  6. Step 6: Final answer
    x = 675.85

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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.