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Finding the Fourth Proportional to 998.66, 1,377.51 and 719.31

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Solution

The fourth proportional to 998.66, 1,377.51 and 719.31 is: 992.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.66 : 1,377.51 = 719.31 : x
  2. Step 2: Convert to fraction form
    998.66/1,377.51 = 719.31/x
  3. Step 3: Cross multiply
    998.66x = 1,377.51 × 719.31
  4. Step 4: Simplify right side
    998.66x = 990,859.19
  5. Step 5: Solve for x
    x = 990,859.19/998.66
  6. Step 6: Final answer
    x = 992.19

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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.