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Finding the Fourth Proportional to 521.49, 777.66 and 443.13

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Solution

The fourth proportional to 521.49, 777.66 and 443.13 is: 660.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.49 : 777.66 = 443.13 : x
  2. Step 2: Convert to fraction form
    521.49/777.66 = 443.13/x
  3. Step 3: Cross multiply
    521.49x = 777.66 × 443.13
  4. Step 4: Simplify right side
    521.49x = 344,604.48
  5. Step 5: Solve for x
    x = 344,604.48/521.49
  6. Step 6: Final answer
    x = 660.81

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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.