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Finding the Fourth Proportional to 998.99, 1,378.63 and 550.88

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Solution

The fourth proportional to 998.99, 1,378.63 and 550.88 is: 760.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.99 : 1,378.63 = 550.88 : x
  2. Step 2: Convert to fraction form
    998.99/1,378.63 = 550.88/x
  3. Step 3: Cross multiply
    998.99x = 1,378.63 × 550.88
  4. Step 4: Simplify right side
    998.99x = 759,459.69
  5. Step 5: Solve for x
    x = 759,459.69/998.99
  6. Step 6: Final answer
    x = 760.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.