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Finding the Fourth Proportional to 664.53, 916.89 and 443.61

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Solution

The fourth proportional to 664.53, 916.89 and 443.61 is: 612.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.53 : 916.89 = 443.61 : x
  2. Step 2: Convert to fraction form
    664.53/916.89 = 443.61/x
  3. Step 3: Cross multiply
    664.53x = 916.89 × 443.61
  4. Step 4: Simplify right side
    664.53x = 406,741.57
  5. Step 5: Solve for x
    x = 406,741.57/664.53
  6. Step 6: Final answer
    x = 612.07

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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.