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Finding the Fourth Proportional to 717.14, 989.28 and 520.82

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Solution

The fourth proportional to 717.14, 989.28 and 520.82 is: 718.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.14 : 989.28 = 520.82 : x
  2. Step 2: Convert to fraction form
    717.14/989.28 = 520.82/x
  3. Step 3: Cross multiply
    717.14x = 989.28 × 520.82
  4. Step 4: Simplify right side
    717.14x = 515,236.81
  5. Step 5: Solve for x
    x = 515,236.81/717.14
  6. Step 6: Final answer
    x = 718.46

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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.