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Finding the Fourth Proportional to 260.04, 389.76 and 221.40

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Solution

The fourth proportional to 260.04, 389.76 and 221.40 is: 331.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.04 : 389.76 = 221.40 : x
  2. Step 2: Convert to fraction form
    260.04/389.76 = 221.40/x
  3. Step 3: Cross multiply
    260.04x = 389.76 × 221.40
  4. Step 4: Simplify right side
    260.04x = 86,292.86
  5. Step 5: Solve for x
    x = 86,292.86/260.04
  6. Step 6: Final answer
    x = 331.84

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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.