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Finding the Fourth Proportional to 988.16, 1,363.41 and 629.39

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Solution

The fourth proportional to 988.16, 1,363.41 and 629.39 is: 868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.16 : 1,363.41 = 629.39 : x
  2. Step 2: Convert to fraction form
    988.16/1,363.41 = 629.39/x
  3. Step 3: Cross multiply
    988.16x = 1,363.41 × 629.39
  4. Step 4: Simplify right side
    988.16x = 858,109.80
  5. Step 5: Solve for x
    x = 858,109.80/988.16
  6. Step 6: Final answer
    x = 868.40

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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.