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Finding the Fourth Proportional to 989, 1,363.79 and 849.58

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Solution

The fourth proportional to 989, 1,363.79 and 849.58 is: 1,171.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 1,363.79 = 849.58 : x
  2. Step 2: Convert to fraction form
    989/1,363.79 = 849.58/x
  3. Step 3: Cross multiply
    989x = 1,363.79 × 849.58
  4. Step 4: Simplify right side
    989x = 1,158,648.71
  5. Step 5: Solve for x
    x = 1,158,648.71/989
  6. Step 6: Final answer
    x = 1,171.54

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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.