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Finding the Fourth Proportional to 1,275.92, 1,912.28 and 544.64

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Solution

The fourth proportional to 1,275.92, 1,912.28 and 544.64 is: 816.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.92 : 1,912.28 = 544.64 : x
  2. Step 2: Convert to fraction form
    1,275.92/1,912.28 = 544.64/x
  3. Step 3: Cross multiply
    1,275.92x = 1,912.28 × 544.64
  4. Step 4: Simplify right side
    1,275.92x = 1,041,504.18
  5. Step 5: Solve for x
    x = 1,041,504.18/1,275.92
  6. Step 6: Final answer
    x = 816.28

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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.