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Finding the Fourth Proportional to 389.28, 585 and 197.04

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Solution

The fourth proportional to 389.28, 585 and 197.04 is: 296.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.28 : 585 = 197.04 : x
  2. Step 2: Convert to fraction form
    389.28/585 = 197.04/x
  3. Step 3: Cross multiply
    389.28x = 585 × 197.04
  4. Step 4: Simplify right side
    389.28x = 115,268.40
  5. Step 5: Solve for x
    x = 115,268.40/389.28
  6. Step 6: Final answer
    x = 296.11

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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.