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Finding the Fourth Proportional to 1,272.46, 1,908.70 and 382.88

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Solution

The fourth proportional to 1,272.46, 1,908.70 and 382.88 is: 574.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.46 : 1,908.70 = 382.88 : x
  2. Step 2: Convert to fraction form
    1,272.46/1,908.70 = 382.88/x
  3. Step 3: Cross multiply
    1,272.46x = 1,908.70 × 382.88
  4. Step 4: Simplify right side
    1,272.46x = 730,803.06
  5. Step 5: Solve for x
    x = 730,803.06/1,272.46
  6. Step 6: Final answer
    x = 574.32

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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.