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Finding the Fourth Proportional to 627.96, 866.70 and 489.72

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Solution

The fourth proportional to 627.96, 866.70 and 489.72 is: 675.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.96 : 866.70 = 489.72 : x
  2. Step 2: Convert to fraction form
    627.96/866.70 = 489.72/x
  3. Step 3: Cross multiply
    627.96x = 866.70 × 489.72
  4. Step 4: Simplify right side
    627.96x = 424,440.32
  5. Step 5: Solve for x
    x = 424,440.32/627.96
  6. Step 6: Final answer
    x = 675.90

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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.