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Finding the Fourth Proportional to 998.55, 1,377.90 and 556.47

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Solution

The fourth proportional to 998.55, 1,377.90 and 556.47 is: 767.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.55 : 1,377.90 = 556.47 : x
  2. Step 2: Convert to fraction form
    998.55/1,377.90 = 556.47/x
  3. Step 3: Cross multiply
    998.55x = 1,377.90 × 556.47
  4. Step 4: Simplify right side
    998.55x = 766,760.01
  5. Step 5: Solve for x
    x = 766,760.01/998.55
  6. Step 6: Final answer
    x = 767.87

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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.