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Finding the Fourth Proportional to 998.87, 1,378.52 and 556.80

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Solution

The fourth proportional to 998.87, 1,378.52 and 556.80 is: 768.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.87 : 1,378.52 = 556.80 : x
  2. Step 2: Convert to fraction form
    998.87/1,378.52 = 556.80/x
  3. Step 3: Cross multiply
    998.87x = 1,378.52 × 556.80
  4. Step 4: Simplify right side
    998.87x = 767,557.15
  5. Step 5: Solve for x
    x = 767,557.15/998.87
  6. Step 6: Final answer
    x = 768.43

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1.5x scale

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.