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Finding the Fourth Proportional to 286.55, 430.04 and 221.72

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Solution

The fourth proportional to 286.55, 430.04 and 221.72 is: 332.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.55 : 430.04 = 221.72 : x
  2. Step 2: Convert to fraction form
    286.55/430.04 = 221.72/x
  3. Step 3: Cross multiply
    286.55x = 430.04 × 221.72
  4. Step 4: Simplify right side
    286.55x = 95,345.21
  5. Step 5: Solve for x
    x = 95,345.21/286.55
  6. Step 6: Final answer
    x = 332.73

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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.