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Finding the Fourth Proportional to 664.20, 916.64 and 369.48

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Solution

The fourth proportional to 664.20, 916.64 and 369.48 is: 509.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.20 : 916.64 = 369.48 : x
  2. Step 2: Convert to fraction form
    664.20/916.64 = 369.48/x
  3. Step 3: Cross multiply
    664.20x = 916.64 × 369.48
  4. Step 4: Simplify right side
    664.20x = 338,678.30
  5. Step 5: Solve for x
    x = 338,678.30/664.20
  6. Step 6: Final answer
    x = 509.90

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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.