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Finding the Fourth Proportional to 664.31, 916.78 and 467.89

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Solution

The fourth proportional to 664.31, 916.78 and 467.89 is: 645.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.31 : 916.78 = 467.89 : x
  2. Step 2: Convert to fraction form
    664.31/916.78 = 467.89/x
  3. Step 3: Cross multiply
    664.31x = 916.78 × 467.89
  4. Step 4: Simplify right side
    664.31x = 428,952.19
  5. Step 5: Solve for x
    x = 428,952.19/664.31
  6. Step 6: Final answer
    x = 645.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.