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Finding the Fourth Proportional to 377.52, 521.40 and 318.72

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Solution

The fourth proportional to 377.52, 521.40 and 318.72 is: 440.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.52 : 521.40 = 318.72 : x
  2. Step 2: Convert to fraction form
    377.52/521.40 = 318.72/x
  3. Step 3: Cross multiply
    377.52x = 521.40 × 318.72
  4. Step 4: Simplify right side
    377.52x = 166,180.61
  5. Step 5: Solve for x
    x = 166,180.61/377.52
  6. Step 6: Final answer
    x = 440.19

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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.