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Finding the Fourth Proportional to 664.16, 916.50 and 369.42

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Solution

The fourth proportional to 664.16, 916.50 and 369.42 is: 509.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.16 : 916.50 = 369.42 : x
  2. Step 2: Convert to fraction form
    664.16/916.50 = 369.42/x
  3. Step 3: Cross multiply
    664.16x = 916.50 × 369.42
  4. Step 4: Simplify right side
    664.16x = 338,573.43
  5. Step 5: Solve for x
    x = 338,573.43/664.16
  6. Step 6: Final answer
    x = 509.78

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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.