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Finding the Fourth Proportional to 717.20, 989.86 and 451.82

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Solution

The fourth proportional to 717.20, 989.86 and 451.82 is: 623.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 989.86 = 451.82 : x
  2. Step 2: Convert to fraction form
    717.20/989.86 = 451.82/x
  3. Step 3: Cross multiply
    717.20x = 989.86 × 451.82
  4. Step 4: Simplify right side
    717.20x = 447,238.55
  5. Step 5: Solve for x
    x = 447,238.55/717.20
  6. Step 6: Final answer
    x = 623.59

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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.