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Finding the Fourth Proportional to 430.43, 645.65 and 122.29

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Solution

The fourth proportional to 430.43, 645.65 and 122.29 is: 183.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.43 : 645.65 = 122.29 : x
  2. Step 2: Convert to fraction form
    430.43/645.65 = 122.29/x
  3. Step 3: Cross multiply
    430.43x = 645.65 × 122.29
  4. Step 4: Simplify right side
    430.43x = 78,954.31
  5. Step 5: Solve for x
    x = 78,954.31/430.43
  6. Step 6: Final answer
    x = 183.43

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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.