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Finding the Fourth Proportional to 431.27, 646.45 and 211.57

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Solution

The fourth proportional to 431.27, 646.45 and 211.57 is: 317.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.27 : 646.45 = 211.57 : x
  2. Step 2: Convert to fraction form
    431.27/646.45 = 211.57/x
  3. Step 3: Cross multiply
    431.27x = 646.45 × 211.57
  4. Step 4: Simplify right side
    431.27x = 136,769.43
  5. Step 5: Solve for x
    x = 136,769.43/431.27
  6. Step 6: Final answer
    x = 317.13

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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.