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Finding the Fourth Proportional to 998.50, 1,377.90 and 556.40

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Solution

The fourth proportional to 998.50, 1,377.90 and 556.40 is: 767.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.50 : 1,377.90 = 556.40 : x
  2. Step 2: Convert to fraction form
    998.50/1,377.90 = 556.40/x
  3. Step 3: Cross multiply
    998.50x = 1,377.90 × 556.40
  4. Step 4: Simplify right side
    998.50x = 766,663.56
  5. Step 5: Solve for x
    x = 766,663.56/998.50
  6. Step 6: Final answer
    x = 767.82

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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.