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Finding the Fourth Proportional to 718.22, 990.69 and 633.98

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Solution

The fourth proportional to 718.22, 990.69 and 633.98 is: 874.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.22 : 990.69 = 633.98 : x
  2. Step 2: Convert to fraction form
    718.22/990.69 = 633.98/x
  3. Step 3: Cross multiply
    718.22x = 990.69 × 633.98
  4. Step 4: Simplify right side
    718.22x = 628,077.65
  5. Step 5: Solve for x
    x = 628,077.65/718.22
  6. Step 6: Final answer
    x = 874.49

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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.