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Finding the Fourth Proportional to 430.70, 646.11 and 142.07

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Solution

The fourth proportional to 430.70, 646.11 and 142.07 is: 213.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.70 : 646.11 = 142.07 : x
  2. Step 2: Convert to fraction form
    430.70/646.11 = 142.07/x
  3. Step 3: Cross multiply
    430.70x = 646.11 × 142.07
  4. Step 4: Simplify right side
    430.70x = 91,789.62
  5. Step 5: Solve for x
    x = 91,789.62/430.70
  6. Step 6: Final answer
    x = 213.12

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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.