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Finding the Fourth Proportional to 377.51, 521.62 and 311.90

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Solution

The fourth proportional to 377.51, 521.62 and 311.90 is: 430.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.51 : 521.62 = 311.90 : x
  2. Step 2: Convert to fraction form
    377.51/521.62 = 311.90/x
  3. Step 3: Cross multiply
    377.51x = 521.62 × 311.90
  4. Step 4: Simplify right side
    377.51x = 162,691.72
  5. Step 5: Solve for x
    x = 162,691.72/377.51
  6. Step 6: Final answer
    x = 430.96

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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.