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Finding the Fourth Proportional to 377.74, 520.63 and 311.55

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Solution

The fourth proportional to 377.74, 520.63 and 311.55 is: 429.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.74 : 520.63 = 311.55 : x
  2. Step 2: Convert to fraction form
    377.74/520.63 = 311.55/x
  3. Step 3: Cross multiply
    377.74x = 520.63 × 311.55
  4. Step 4: Simplify right side
    377.74x = 162,202.28
  5. Step 5: Solve for x
    x = 162,202.28/377.74
  6. Step 6: Final answer
    x = 429.40

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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.