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Finding the Fourth Proportional to 978.75, 1,350.09 and 629.46

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Solution

The fourth proportional to 978.75, 1,350.09 and 629.46 is: 868.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.75 : 1,350.09 = 629.46 : x
  2. Step 2: Convert to fraction form
    978.75/1,350.09 = 629.46/x
  3. Step 3: Cross multiply
    978.75x = 1,350.09 × 629.46
  4. Step 4: Simplify right side
    978.75x = 849,827.65
  5. Step 5: Solve for x
    x = 849,827.65/978.75
  6. Step 6: Final answer
    x = 868.28

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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.