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Finding the Fourth Proportional to 585.37, 878.19 and 385.21

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Solution

The fourth proportional to 585.37, 878.19 and 385.21 is: 577.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.37 : 878.19 = 385.21 : x
  2. Step 2: Convert to fraction form
    585.37/878.19 = 385.21/x
  3. Step 3: Cross multiply
    585.37x = 878.19 × 385.21
  4. Step 4: Simplify right side
    585.37x = 338,287.57
  5. Step 5: Solve for x
    x = 338,287.57/585.37
  6. Step 6: Final answer
    x = 577.90

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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.