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Finding the Fourth Proportional to 998.15, 1,377.48 and 556.14

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Solution

The fourth proportional to 998.15, 1,377.48 and 556.14 is: 767.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.15 : 1,377.48 = 556.14 : x
  2. Step 2: Convert to fraction form
    998.15/1,377.48 = 556.14/x
  3. Step 3: Cross multiply
    998.15x = 1,377.48 × 556.14
  4. Step 4: Simplify right side
    998.15x = 766,071.73
  5. Step 5: Solve for x
    x = 766,071.73/998.15
  6. Step 6: Final answer
    x = 767.50

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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.