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Finding the Fourth Proportional to 377.77, 521.24 and 318.64

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Solution

The fourth proportional to 377.77, 521.24 and 318.64 is: 439.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.77 : 521.24 = 318.64 : x
  2. Step 2: Convert to fraction form
    377.77/521.24 = 318.64/x
  3. Step 3: Cross multiply
    377.77x = 521.24 × 318.64
  4. Step 4: Simplify right side
    377.77x = 166,087.41
  5. Step 5: Solve for x
    x = 166,087.41/377.77
  6. Step 6: Final answer
    x = 439.66

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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.