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Finding the Fourth Proportional to 430.25, 645.21 and 267.84

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Solution

The fourth proportional to 430.25, 645.21 and 267.84 is: 401.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.25 : 645.21 = 267.84 : x
  2. Step 2: Convert to fraction form
    430.25/645.21 = 267.84/x
  3. Step 3: Cross multiply
    430.25x = 645.21 × 267.84
  4. Step 4: Simplify right side
    430.25x = 172,813.05
  5. Step 5: Solve for x
    x = 172,813.05/430.25
  6. Step 6: Final answer
    x = 401.66

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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.