Home / 1,311.36-1,966.96-489.28

Finding the Fourth Proportional to 1,311.36, 1,966.96 and 489.28

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Solution

The fourth proportional to 1,311.36, 1,966.96 and 489.28 is: 733.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.36 : 1,966.96 = 489.28 : x
  2. Step 2: Convert to fraction form
    1,311.36/1,966.96 = 489.28/x
  3. Step 3: Cross multiply
    1,311.36x = 1,966.96 × 489.28
  4. Step 4: Simplify right side
    1,311.36x = 962,394.19
  5. Step 5: Solve for x
    x = 962,394.19/1,311.36
  6. Step 6: Final answer
    x = 733.89

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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.