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Finding the Fourth Proportional to 1,272.86, 1,908.68 and 493.22

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Solution

The fourth proportional to 1,272.86, 1,908.68 and 493.22 is: 739.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.86 : 1,908.68 = 493.22 : x
  2. Step 2: Convert to fraction form
    1,272.86/1,908.68 = 493.22/x
  3. Step 3: Cross multiply
    1,272.86x = 1,908.68 × 493.22
  4. Step 4: Simplify right side
    1,272.86x = 941,406.31
  5. Step 5: Solve for x
    x = 941,406.31/1,272.86
  6. Step 6: Final answer
    x = 739.60

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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.