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Finding the Fourth Proportional to 628.27, 940.42 and 432.12

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Solution

The fourth proportional to 628.27, 940.42 and 432.12 is: 646.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.27 : 940.42 = 432.12 : x
  2. Step 2: Convert to fraction form
    628.27/940.42 = 432.12/x
  3. Step 3: Cross multiply
    628.27x = 940.42 × 432.12
  4. Step 4: Simplify right side
    628.27x = 406,374.29
  5. Step 5: Solve for x
    x = 406,374.29/628.27
  6. Step 6: Final answer
    x = 646.81

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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.