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Finding the Fourth Proportional to 1,727.91, 2,591.86 and 429.38

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Solution

The fourth proportional to 1,727.91, 2,591.86 and 429.38 is: 644.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,727.91 : 2,591.86 = 429.38 : x
  2. Step 2: Convert to fraction form
    1,727.91/2,591.86 = 429.38/x
  3. Step 3: Cross multiply
    1,727.91x = 2,591.86 × 429.38
  4. Step 4: Simplify right side
    1,727.91x = 1,112,892.85
  5. Step 5: Solve for x
    x = 1,112,892.85/1,727.91
  6. Step 6: Final answer
    x = 644.07

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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.