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Finding the Fourth Proportional to 376.66, 520.15 and 356.21

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Solution

The fourth proportional to 376.66, 520.15 and 356.21 is: 491.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.66 : 520.15 = 356.21 : x
  2. Step 2: Convert to fraction form
    376.66/520.15 = 356.21/x
  3. Step 3: Cross multiply
    376.66x = 520.15 × 356.21
  4. Step 4: Simplify right side
    376.66x = 185,279.14
  5. Step 5: Solve for x
    x = 185,279.14/376.66
  6. Step 6: Final answer
    x = 491.90

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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.