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Finding the Fourth Proportional to 1,276.16, 1,912.46 and 581.12

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Solution

The fourth proportional to 1,276.16, 1,912.46 and 581.12 is: 870.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.16 : 1,912.46 = 581.12 : x
  2. Step 2: Convert to fraction form
    1,276.16/1,912.46 = 581.12/x
  3. Step 3: Cross multiply
    1,276.16x = 1,912.46 × 581.12
  4. Step 4: Simplify right side
    1,276.16x = 1,111,377.49
  5. Step 5: Solve for x
    x = 1,111,377.49/1,276.16
  6. Step 6: Final answer
    x = 870.88

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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.