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Finding the Fourth Proportional to 1,811.76, 2,716.93 and 641.31

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Solution

The fourth proportional to 1,811.76, 2,716.93 and 641.31 is: 961.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.76 : 2,716.93 = 641.31 : x
  2. Step 2: Convert to fraction form
    1,811.76/2,716.93 = 641.31/x
  3. Step 3: Cross multiply
    1,811.76x = 2,716.93 × 641.31
  4. Step 4: Simplify right side
    1,811.76x = 1,742,381.38
  5. Step 5: Solve for x
    x = 1,742,381.38/1,811.76
  6. Step 6: Final answer
    x = 961.71

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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.