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Finding the Fourth Proportional to 381.80, 527.40 and 303.63

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Solution

The fourth proportional to 381.80, 527.40 and 303.63 is: 419.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.80 : 527.40 = 303.63 : x
  2. Step 2: Convert to fraction form
    381.80/527.40 = 303.63/x
  3. Step 3: Cross multiply
    381.80x = 527.40 × 303.63
  4. Step 4: Simplify right side
    381.80x = 160,134.46
  5. Step 5: Solve for x
    x = 160,134.46/381.80
  6. Step 6: Final answer
    x = 419.43

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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.