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Finding the Fourth Proportional to 998.01, 1,376.55 and 644.04

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Solution

The fourth proportional to 998.01, 1,376.55 and 644.04 is: 888.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.01 : 1,376.55 = 644.04 : x
  2. Step 2: Convert to fraction form
    998.01/1,376.55 = 644.04/x
  3. Step 3: Cross multiply
    998.01x = 1,376.55 × 644.04
  4. Step 4: Simplify right side
    998.01x = 886,553.26
  5. Step 5: Solve for x
    x = 886,553.26/998.01
  6. Step 6: Final answer
    x = 888.32

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1.5x scale

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.