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Finding the Fourth Proportional to 586.60, 879.80 and 221.20

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Solution

The fourth proportional to 586.60, 879.80 and 221.20 is: 331.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.60 : 879.80 = 221.20 : x
  2. Step 2: Convert to fraction form
    586.60/879.80 = 221.20/x
  3. Step 3: Cross multiply
    586.60x = 879.80 × 221.20
  4. Step 4: Simplify right side
    586.60x = 194,611.76
  5. Step 5: Solve for x
    x = 194,611.76/586.60
  6. Step 6: Final answer
    x = 331.76

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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.