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Finding the Fourth Proportional to 716.66, 989 and 401.92

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Solution

The fourth proportional to 716.66, 989 and 401.92 is: 554.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.66 : 989 = 401.92 : x
  2. Step 2: Convert to fraction form
    716.66/989 = 401.92/x
  3. Step 3: Cross multiply
    716.66x = 989 × 401.92
  4. Step 4: Simplify right side
    716.66x = 397,498.88
  5. Step 5: Solve for x
    x = 397,498.88/716.66
  6. Step 6: Final answer
    x = 554.65

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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.