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Finding the Fourth Proportional to 998.58, 1,378.05 and 556.50

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Solution

The fourth proportional to 998.58, 1,378.05 and 556.50 is: 767.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.58 : 1,378.05 = 556.50 : x
  2. Step 2: Convert to fraction form
    998.58/1,378.05 = 556.50/x
  3. Step 3: Cross multiply
    998.58x = 1,378.05 × 556.50
  4. Step 4: Simplify right side
    998.58x = 766,884.83
  5. Step 5: Solve for x
    x = 766,884.83/998.58
  6. Step 6: Final answer
    x = 767.98

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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.