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Finding the Fourth Proportional to 1,275.54, 1,912.23 and 505.50

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Solution

The fourth proportional to 1,275.54, 1,912.23 and 505.50 is: 757.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.54 : 1,912.23 = 505.50 : x
  2. Step 2: Convert to fraction form
    1,275.54/1,912.23 = 505.50/x
  3. Step 3: Cross multiply
    1,275.54x = 1,912.23 × 505.50
  4. Step 4: Simplify right side
    1,275.54x = 966,632.27
  5. Step 5: Solve for x
    x = 966,632.27/1,275.54
  6. Step 6: Final answer
    x = 757.82

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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.