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Finding the Fourth Proportional to 989.43, 1,365.49 and 616.42

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Solution

The fourth proportional to 989.43, 1,365.49 and 616.42 is: 850.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.43 : 1,365.49 = 616.42 : x
  2. Step 2: Convert to fraction form
    989.43/1,365.49 = 616.42/x
  3. Step 3: Cross multiply
    989.43x = 1,365.49 × 616.42
  4. Step 4: Simplify right side
    989.43x = 841,715.35
  5. Step 5: Solve for x
    x = 841,715.35/989.43
  6. Step 6: Final answer
    x = 850.71

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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.