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Finding the Fourth Proportional to 430.82, 646.09 and 142.19

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Solution

The fourth proportional to 430.82, 646.09 and 142.19 is: 213.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.82 : 646.09 = 142.19 : x
  2. Step 2: Convert to fraction form
    430.82/646.09 = 142.19/x
  3. Step 3: Cross multiply
    430.82x = 646.09 × 142.19
  4. Step 4: Simplify right side
    430.82x = 91,867.54
  5. Step 5: Solve for x
    x = 91,867.54/430.82
  6. Step 6: Final answer
    x = 213.24

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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.