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Finding the Fourth Proportional to 443.17, 664.20 and 388.19

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Solution

The fourth proportional to 443.17, 664.20 and 388.19 is: 581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.17 : 664.20 = 388.19 : x
  2. Step 2: Convert to fraction form
    443.17/664.20 = 388.19/x
  3. Step 3: Cross multiply
    443.17x = 664.20 × 388.19
  4. Step 4: Simplify right side
    443.17x = 257,837.46
  5. Step 5: Solve for x
    x = 257,837.46/443.17
  6. Step 6: Final answer
    x = 581.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.