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Finding the Fourth Proportional to 634.71, 876.66 and 489.09

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Solution

The fourth proportional to 634.71, 876.66 and 489.09 is: 675.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.71 : 876.66 = 489.09 : x
  2. Step 2: Convert to fraction form
    634.71/876.66 = 489.09/x
  3. Step 3: Cross multiply
    634.71x = 876.66 × 489.09
  4. Step 4: Simplify right side
    634.71x = 428,765.64
  5. Step 5: Solve for x
    x = 428,765.64/634.71
  6. Step 6: Final answer
    x = 675.53

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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.