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Finding the Fourth Proportional to 253.35, 381.62 and 239.70

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Solution

The fourth proportional to 253.35, 381.62 and 239.70 is: 361.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.35 : 381.62 = 239.70 : x
  2. Step 2: Convert to fraction form
    253.35/381.62 = 239.70/x
  3. Step 3: Cross multiply
    253.35x = 381.62 × 239.70
  4. Step 4: Simplify right side
    253.35x = 91,473.12
  5. Step 5: Solve for x
    x = 91,473.12/253.35
  6. Step 6: Final answer
    x = 361.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.