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Finding the Fourth Proportional to 978.75, 1,350.77 and 629.73

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Solution

The fourth proportional to 978.75, 1,350.77 and 629.73 is: 869.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.75 : 1,350.77 = 629.73 : x
  2. Step 2: Convert to fraction form
    978.75/1,350.77 = 629.73/x
  3. Step 3: Cross multiply
    978.75x = 1,350.77 × 629.73
  4. Step 4: Simplify right side
    978.75x = 850,617.24
  5. Step 5: Solve for x
    x = 850,617.24/978.75
  6. Step 6: Final answer
    x = 869.09

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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.