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Finding the Fourth Proportional to 718.22, 990.68 and 497.09

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Solution

The fourth proportional to 718.22, 990.68 and 497.09 is: 685.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.22 : 990.68 = 497.09 : x
  2. Step 2: Convert to fraction form
    718.22/990.68 = 497.09/x
  3. Step 3: Cross multiply
    718.22x = 990.68 × 497.09
  4. Step 4: Simplify right side
    718.22x = 492,449.68
  5. Step 5: Solve for x
    x = 492,449.68/718.22
  6. Step 6: Final answer
    x = 685.66

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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.