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Finding the Fourth Proportional to 1,269.40, 1,903.73 and 489.35

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Solution

The fourth proportional to 1,269.40, 1,903.73 and 489.35 is: 733.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.40 : 1,903.73 = 489.35 : x
  2. Step 2: Convert to fraction form
    1,269.40/1,903.73 = 489.35/x
  3. Step 3: Cross multiply
    1,269.40x = 1,903.73 × 489.35
  4. Step 4: Simplify right side
    1,269.40x = 931,590.28
  5. Step 5: Solve for x
    x = 931,590.28/1,269.40
  6. Step 6: Final answer
    x = 733.88

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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.