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Finding the Fourth Proportional to 1,811.90, 2,717.74 and 641.96

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Solution

The fourth proportional to 1,811.90, 2,717.74 and 641.96 is: 962.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.90 : 2,717.74 = 641.96 : x
  2. Step 2: Convert to fraction form
    1,811.90/2,717.74 = 641.96/x
  3. Step 3: Cross multiply
    1,811.90x = 2,717.74 × 641.96
  4. Step 4: Simplify right side
    1,811.90x = 1,744,680.37
  5. Step 5: Solve for x
    x = 1,744,680.37/1,811.90
  6. Step 6: Final answer
    x = 962.90

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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.