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Finding the Fourth Proportional to 664.18, 916.35 and 443.05

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Solution

The fourth proportional to 664.18, 916.35 and 443.05 is: 611.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.18 : 916.35 = 443.05 : x
  2. Step 2: Convert to fraction form
    664.18/916.35 = 443.05/x
  3. Step 3: Cross multiply
    664.18x = 916.35 × 443.05
  4. Step 4: Simplify right side
    664.18x = 405,988.87
  5. Step 5: Solve for x
    x = 405,988.87/664.18
  6. Step 6: Final answer
    x = 611.26

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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.