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Finding the Fourth Proportional to 1,272.71, 1,908.47 and 493.09

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Solution

The fourth proportional to 1,272.71, 1,908.47 and 493.09 is: 739.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.71 : 1,908.47 = 493.09 : x
  2. Step 2: Convert to fraction form
    1,272.71/1,908.47 = 493.09/x
  3. Step 3: Cross multiply
    1,272.71x = 1,908.47 × 493.09
  4. Step 4: Simplify right side
    1,272.71x = 941,043.93
  5. Step 5: Solve for x
    x = 941,043.93/1,272.71
  6. Step 6: Final answer
    x = 739.40

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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.