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Finding the Fourth Proportional to 431.84, 647.25 and 212.56

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Solution

The fourth proportional to 431.84, 647.25 and 212.56 is: 318.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.84 : 647.25 = 212.56 : x
  2. Step 2: Convert to fraction form
    431.84/647.25 = 212.56/x
  3. Step 3: Cross multiply
    431.84x = 647.25 × 212.56
  4. Step 4: Simplify right side
    431.84x = 137,579.47
  5. Step 5: Solve for x
    x = 137,579.47/431.84
  6. Step 6: Final answer
    x = 318.59

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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.