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Finding the Fourth Proportional to 717.18, 987.03 and 629.70

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Solution

The fourth proportional to 717.18, 987.03 and 629.70 is: 866.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.18 : 987.03 = 629.70 : x
  2. Step 2: Convert to fraction form
    717.18/987.03 = 629.70/x
  3. Step 3: Cross multiply
    717.18x = 987.03 × 629.70
  4. Step 4: Simplify right side
    717.18x = 621,532.79
  5. Step 5: Solve for x
    x = 621,532.79/717.18
  6. Step 6: Final answer
    x = 866.63

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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.