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Finding the Fourth Proportional to 717.24, 989.45 and 451.79

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Solution

The fourth proportional to 717.24, 989.45 and 451.79 is: 623.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.24 : 989.45 = 451.79 : x
  2. Step 2: Convert to fraction form
    717.24/989.45 = 451.79/x
  3. Step 3: Cross multiply
    717.24x = 989.45 × 451.79
  4. Step 4: Simplify right side
    717.24x = 447,018.67
  5. Step 5: Solve for x
    x = 447,018.67/717.24
  6. Step 6: Final answer
    x = 623.25

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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.