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Finding the Fourth Proportional to 389.97, 585.05 and 116.09

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Solution

The fourth proportional to 389.97, 585.05 and 116.09 is: 174.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.97 : 585.05 = 116.09 : x
  2. Step 2: Convert to fraction form
    389.97/585.05 = 116.09/x
  3. Step 3: Cross multiply
    389.97x = 585.05 × 116.09
  4. Step 4: Simplify right side
    389.97x = 67,916.05
  5. Step 5: Solve for x
    x = 67,916.05/389.97
  6. Step 6: Final answer
    x = 174.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.