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Finding the Fourth Proportional to 678.13, 1,015.75 and 629.17

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Solution

The fourth proportional to 678.13, 1,015.75 and 629.17 is: 942.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.13 : 1,015.75 = 629.17 : x
  2. Step 2: Convert to fraction form
    678.13/1,015.75 = 629.17/x
  3. Step 3: Cross multiply
    678.13x = 1,015.75 × 629.17
  4. Step 4: Simplify right side
    678.13x = 639,079.43
  5. Step 5: Solve for x
    x = 639,079.43/678.13
  6. Step 6: Final answer
    x = 942.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.