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Finding the Fourth Proportional to 717.12, 1,069.74 and 629.64

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Solution

The fourth proportional to 717.12, 1,069.74 and 629.64 is: 939.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.12 : 1,069.74 = 629.64 : x
  2. Step 2: Convert to fraction form
    717.12/1,069.74 = 629.64/x
  3. Step 3: Cross multiply
    717.12x = 1,069.74 × 629.64
  4. Step 4: Simplify right side
    717.12x = 673,551.09
  5. Step 5: Solve for x
    x = 673,551.09/717.12
  6. Step 6: Final answer
    x = 939.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.