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Finding the Fourth Proportional to 664.34, 916.34 and 443.30

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Solution

The fourth proportional to 664.34, 916.34 and 443.30 is: 611.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.34 : 916.34 = 443.30 : x
  2. Step 2: Convert to fraction form
    664.34/916.34 = 443.30/x
  3. Step 3: Cross multiply
    664.34x = 916.34 × 443.30
  4. Step 4: Simplify right side
    664.34x = 406,206.72
  5. Step 5: Solve for x
    x = 406,206.72/664.34
  6. Step 6: Final answer
    x = 611.45

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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.