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Finding the Fourth Proportional to 664.22, 916.66 and 369.48

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Solution

The fourth proportional to 664.22, 916.66 and 369.48 is: 509.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.22 : 916.66 = 369.48 : x
  2. Step 2: Convert to fraction form
    664.22/916.66 = 369.48/x
  3. Step 3: Cross multiply
    664.22x = 916.66 × 369.48
  4. Step 4: Simplify right side
    664.22x = 338,690.85
  5. Step 5: Solve for x
    x = 338,690.85/664.22
  6. Step 6: Final answer
    x = 509.91

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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.