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Finding the Fourth Proportional to 998.42, 1,378.77 and 943.88

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Solution

The fourth proportional to 998.42, 1,378.77 and 943.88 is: 1,303.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.42 : 1,378.77 = 943.88 : x
  2. Step 2: Convert to fraction form
    998.42/1,378.77 = 943.88/x
  3. Step 3: Cross multiply
    998.42x = 1,378.77 × 943.88
  4. Step 4: Simplify right side
    998.42x = 1,301,393.43
  5. Step 5: Solve for x
    x = 1,301,393.43/998.42
  6. Step 6: Final answer
    x = 1,303.45

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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.