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Finding the Fourth Proportional to 1,173.80, 1,759.42 and 489

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Solution

The fourth proportional to 1,173.80, 1,759.42 and 489 is: 732.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.80 : 1,759.42 = 489 : x
  2. Step 2: Convert to fraction form
    1,173.80/1,759.42 = 489/x
  3. Step 3: Cross multiply
    1,173.80x = 1,759.42 × 489
  4. Step 4: Simplify right side
    1,173.80x = 860,356.38
  5. Step 5: Solve for x
    x = 860,356.38/1,173.80
  6. Step 6: Final answer
    x = 732.97

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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.