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Finding the Fourth Proportional to 585.31, 877.80 and 219.90

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Solution

The fourth proportional to 585.31, 877.80 and 219.90 is: 329.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.31 : 877.80 = 219.90 : x
  2. Step 2: Convert to fraction form
    585.31/877.80 = 219.90/x
  3. Step 3: Cross multiply
    585.31x = 877.80 × 219.90
  4. Step 4: Simplify right side
    585.31x = 193,027.40
  5. Step 5: Solve for x
    x = 193,027.40/585.31
  6. Step 6: Final answer
    x = 329.79

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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.