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Finding the Fourth Proportional to 238.21, 328.56 and 155.40

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Solution

The fourth proportional to 238.21, 328.56 and 155.40 is: 214.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.21 : 328.56 = 155.40 : x
  2. Step 2: Convert to fraction form
    238.21/328.56 = 155.40/x
  3. Step 3: Cross multiply
    238.21x = 328.56 × 155.40
  4. Step 4: Simplify right side
    238.21x = 51,058.22
  5. Step 5: Solve for x
    x = 51,058.22/238.21
  6. Step 6: Final answer
    x = 214.34

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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.