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Finding the Fourth Proportional to 1,814.60, 2,720.79 and 991.73

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Solution

The fourth proportional to 1,814.60, 2,720.79 and 991.73 is: 1,486.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,814.60 : 2,720.79 = 991.73 : x
  2. Step 2: Convert to fraction form
    1,814.60/2,720.79 = 991.73/x
  3. Step 3: Cross multiply
    1,814.60x = 2,720.79 × 991.73
  4. Step 4: Simplify right side
    1,814.60x = 2,698,289.07
  5. Step 5: Solve for x
    x = 2,698,289.07/1,814.60
  6. Step 6: Final answer
    x = 1,486.99

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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.