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Finding the Fourth Proportional to 1,811.88, 2,717.66 and 657.64

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Solution

The fourth proportional to 1,811.88, 2,717.66 and 657.64 is: 986.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.88 : 2,717.66 = 657.64 : x
  2. Step 2: Convert to fraction form
    1,811.88/2,717.66 = 657.64/x
  3. Step 3: Cross multiply
    1,811.88x = 2,717.66 × 657.64
  4. Step 4: Simplify right side
    1,811.88x = 1,787,241.92
  5. Step 5: Solve for x
    x = 1,787,241.92/1,811.88
  6. Step 6: Final answer
    x = 986.40

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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.