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Finding the Fourth Proportional to 716.33, 987.33 and 494.79

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Solution

The fourth proportional to 716.33, 987.33 and 494.79 is: 681.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.33 : 987.33 = 494.79 : x
  2. Step 2: Convert to fraction form
    716.33/987.33 = 494.79/x
  3. Step 3: Cross multiply
    716.33x = 987.33 × 494.79
  4. Step 4: Simplify right side
    716.33x = 488,521.01
  5. Step 5: Solve for x
    x = 488,521.01/716.33
  6. Step 6: Final answer
    x = 681.98

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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.