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Finding the Fourth Proportional to 431.06, 646.43 and 211.55

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Solution

The fourth proportional to 431.06, 646.43 and 211.55 is: 317.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.06 : 646.43 = 211.55 : x
  2. Step 2: Convert to fraction form
    431.06/646.43 = 211.55/x
  3. Step 3: Cross multiply
    431.06x = 646.43 × 211.55
  4. Step 4: Simplify right side
    431.06x = 136,747.98
  5. Step 5: Solve for x
    x = 136,747.98/431.06
  6. Step 6: Final answer
    x = 317.24

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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.