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Finding the Fourth Proportional to 998.77, 1,378.27 and 556.64

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Solution

The fourth proportional to 998.77, 1,378.27 and 556.64 is: 768.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.77 : 1,378.27 = 556.64 : x
  2. Step 2: Convert to fraction form
    998.77/1,378.27 = 556.64/x
  3. Step 3: Cross multiply
    998.77x = 1,378.27 × 556.64
  4. Step 4: Simplify right side
    998.77x = 767,200.21
  5. Step 5: Solve for x
    x = 767,200.21/998.77
  6. Step 6: Final answer
    x = 768.15

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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.