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Finding the Fourth Proportional to 1,270.84, 1,905.30 and 684.28

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Solution

The fourth proportional to 1,270.84, 1,905.30 and 684.28 is: 1,025.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.84 : 1,905.30 = 684.28 : x
  2. Step 2: Convert to fraction form
    1,270.84/1,905.30 = 684.28/x
  3. Step 3: Cross multiply
    1,270.84x = 1,905.30 × 684.28
  4. Step 4: Simplify right side
    1,270.84x = 1,303,758.68
  5. Step 5: Solve for x
    x = 1,303,758.68/1,270.84
  6. Step 6: Final answer
    x = 1,025.90

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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.