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Finding the Fourth Proportional to 998.50, 1,377.98 and 649.80

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Solution

The fourth proportional to 998.50, 1,377.98 and 649.80 is: 896.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.50 : 1,377.98 = 649.80 : x
  2. Step 2: Convert to fraction form
    998.50/1,377.98 = 649.80/x
  3. Step 3: Cross multiply
    998.50x = 1,377.98 × 649.80
  4. Step 4: Simplify right side
    998.50x = 895,411.40
  5. Step 5: Solve for x
    x = 895,411.40/998.50
  6. Step 6: Final answer
    x = 896.76

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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.