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Finding the Fourth Proportional to 443.43, 661.88 and 391.53

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Solution

The fourth proportional to 443.43, 661.88 and 391.53 is: 584.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.43 : 661.88 = 391.53 : x
  2. Step 2: Convert to fraction form
    443.43/661.88 = 391.53/x
  3. Step 3: Cross multiply
    443.43x = 661.88 × 391.53
  4. Step 4: Simplify right side
    443.43x = 259,145.88
  5. Step 5: Solve for x
    x = 259,145.88/443.43
  6. Step 6: Final answer
    x = 584.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.