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Finding the Fourth Proportional to 998.30, 1,376.95 and 811.79

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Solution

The fourth proportional to 998.30, 1,376.95 and 811.79 is: 1,119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.30 : 1,376.95 = 811.79 : x
  2. Step 2: Convert to fraction form
    998.30/1,376.95 = 811.79/x
  3. Step 3: Cross multiply
    998.30x = 1,376.95 × 811.79
  4. Step 4: Simplify right side
    998.30x = 1,117,794.24
  5. Step 5: Solve for x
    x = 1,117,794.24/998.30
  6. Step 6: Final answer
    x = 1,119.70

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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.