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Finding the Fourth Proportional to 998.56, 1,378.05 and 556.45

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Solution

The fourth proportional to 998.56, 1,378.05 and 556.45 is: 767.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.56 : 1,378.05 = 556.45 : x
  2. Step 2: Convert to fraction form
    998.56/1,378.05 = 556.45/x
  3. Step 3: Cross multiply
    998.56x = 1,378.05 × 556.45
  4. Step 4: Simplify right side
    998.56x = 766,812.48
  5. Step 5: Solve for x
    x = 766,812.48/998.56
  6. Step 6: Final answer
    x = 767.92

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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.