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Finding the Fourth Proportional to 1,274.64, 1,912.61 and 581.21

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Solution

The fourth proportional to 1,274.64, 1,912.61 and 581.21 is: 872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.64 : 1,912.61 = 581.21 : x
  2. Step 2: Convert to fraction form
    1,274.64/1,912.61 = 581.21/x
  3. Step 3: Cross multiply
    1,274.64x = 1,912.61 × 581.21
  4. Step 4: Simplify right side
    1,274.64x = 1,111,628.06
  5. Step 5: Solve for x
    x = 1,111,628.06/1,274.64
  6. Step 6: Final answer
    x = 872.11

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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.