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Finding the Fourth Proportional to 664.16, 916.69 and 443.12

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Solution

The fourth proportional to 664.16, 916.69 and 443.12 is: 611.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.16 : 916.69 = 443.12 : x
  2. Step 2: Convert to fraction form
    664.16/916.69 = 443.12/x
  3. Step 3: Cross multiply
    664.16x = 916.69 × 443.12
  4. Step 4: Simplify right side
    664.16x = 406,203.67
  5. Step 5: Solve for x
    x = 406,203.67/664.16
  6. Step 6: Final answer
    x = 611.61

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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.