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Finding the Fourth Proportional to 1,220.31, 1,830.38 and 489.38

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Solution

The fourth proportional to 1,220.31, 1,830.38 and 489.38 is: 734.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.31 : 1,830.38 = 489.38 : x
  2. Step 2: Convert to fraction form
    1,220.31/1,830.38 = 489.38/x
  3. Step 3: Cross multiply
    1,220.31x = 1,830.38 × 489.38
  4. Step 4: Simplify right side
    1,220.31x = 895,739.77
  5. Step 5: Solve for x
    x = 895,739.77/1,220.31
  6. Step 6: Final answer
    x = 734.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.