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Finding the Fourth Proportional to 738.28, 1,018.48 and 489.72

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Solution

The fourth proportional to 738.28, 1,018.48 and 489.72 is: 675.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.28 : 1,018.48 = 489.72 : x
  2. Step 2: Convert to fraction form
    738.28/1,018.48 = 489.72/x
  3. Step 3: Cross multiply
    738.28x = 1,018.48 × 489.72
  4. Step 4: Simplify right side
    738.28x = 498,770.03
  5. Step 5: Solve for x
    x = 498,770.03/738.28
  6. Step 6: Final answer
    x = 675.58

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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.