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Finding the Fourth Proportional to 586.40, 879.47 and 221.18

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Solution

The fourth proportional to 586.40, 879.47 and 221.18 is: 331.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.40 : 879.47 = 221.18 : x
  2. Step 2: Convert to fraction form
    586.40/879.47 = 221.18/x
  3. Step 3: Cross multiply
    586.40x = 879.47 × 221.18
  4. Step 4: Simplify right side
    586.40x = 194,521.17
  5. Step 5: Solve for x
    x = 194,521.17/586.40
  6. Step 6: Final answer
    x = 331.72

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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.