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Finding the Fourth Proportional to 586.20, 879.42 and 221.10

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Solution

The fourth proportional to 586.20, 879.42 and 221.10 is: 331.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.20 : 879.42 = 221.10 : x
  2. Step 2: Convert to fraction form
    586.20/879.42 = 221.10/x
  3. Step 3: Cross multiply
    586.20x = 879.42 × 221.10
  4. Step 4: Simplify right side
    586.20x = 194,439.76
  5. Step 5: Solve for x
    x = 194,439.76/586.20
  6. Step 6: Final answer
    x = 331.70

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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.