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Finding the Fourth Proportional to 1,272.57, 1,908.84 and 503.61

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Solution

The fourth proportional to 1,272.57, 1,908.84 and 503.61 is: 755.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.57 : 1,908.84 = 503.61 : x
  2. Step 2: Convert to fraction form
    1,272.57/1,908.84 = 503.61/x
  3. Step 3: Cross multiply
    1,272.57x = 1,908.84 × 503.61
  4. Step 4: Simplify right side
    1,272.57x = 961,310.91
  5. Step 5: Solve for x
    x = 961,310.91/1,272.57
  6. Step 6: Final answer
    x = 755.41

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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.