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Finding the Fourth Proportional to 1,276.40, 1,912.80 and 506

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Solution

The fourth proportional to 1,276.40, 1,912.80 and 506 is: 758.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.40 : 1,912.80 = 506 : x
  2. Step 2: Convert to fraction form
    1,276.40/1,912.80 = 506/x
  3. Step 3: Cross multiply
    1,276.40x = 1,912.80 × 506
  4. Step 4: Simplify right side
    1,276.40x = 967,876.80
  5. Step 5: Solve for x
    x = 967,876.80/1,276.40
  6. Step 6: Final answer
    x = 758.29

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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.