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Finding the Fourth Proportional to 998.08, 1,377.98 and 644.13

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Solution

The fourth proportional to 998.08, 1,377.98 and 644.13 is: 889.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.08 : 1,377.98 = 644.13 : x
  2. Step 2: Convert to fraction form
    998.08/1,377.98 = 644.13/x
  3. Step 3: Cross multiply
    998.08x = 1,377.98 × 644.13
  4. Step 4: Simplify right side
    998.08x = 887,598.26
  5. Step 5: Solve for x
    x = 887,598.26/998.08
  6. Step 6: Final answer
    x = 889.31

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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.