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Finding the Fourth Proportional to 738.40, 1,018.38 and 489.73

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Solution

The fourth proportional to 738.40, 1,018.38 and 489.73 is: 675.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.40 : 1,018.38 = 489.73 : x
  2. Step 2: Convert to fraction form
    738.40/1,018.38 = 489.73/x
  3. Step 3: Cross multiply
    738.40x = 1,018.38 × 489.73
  4. Step 4: Simplify right side
    738.40x = 498,731.24
  5. Step 5: Solve for x
    x = 498,731.24/738.40
  6. Step 6: Final answer
    x = 675.42

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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.