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Finding the Fourth Proportional to 688.92, 1,037.11 and 629.40

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Solution

The fourth proportional to 688.92, 1,037.11 and 629.40 is: 947.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.92 : 1,037.11 = 629.40 : x
  2. Step 2: Convert to fraction form
    688.92/1,037.11 = 629.40/x
  3. Step 3: Cross multiply
    688.92x = 1,037.11 × 629.40
  4. Step 4: Simplify right side
    688.92x = 652,757.03
  5. Step 5: Solve for x
    x = 652,757.03/688.92
  6. Step 6: Final answer
    x = 947.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.