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Finding the Fourth Proportional to 1,811.84, 2,716.67 and 988.97

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Solution

The fourth proportional to 1,811.84, 2,716.67 and 988.97 is: 1,482.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.84 : 2,716.67 = 988.97 : x
  2. Step 2: Convert to fraction form
    1,811.84/2,716.67 = 988.97/x
  3. Step 3: Cross multiply
    1,811.84x = 2,716.67 × 988.97
  4. Step 4: Simplify right side
    1,811.84x = 2,686,714.39
  5. Step 5: Solve for x
    x = 2,686,714.39/1,811.84
  6. Step 6: Final answer
    x = 1,482.86

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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.