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Finding the Fourth Proportional to 427.20, 589.54 and 238.16

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Solution

The fourth proportional to 427.20, 589.54 and 238.16 is: 328.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.20 : 589.54 = 238.16 : x
  2. Step 2: Convert to fraction form
    427.20/589.54 = 238.16/x
  3. Step 3: Cross multiply
    427.20x = 589.54 × 238.16
  4. Step 4: Simplify right side
    427.20x = 140,403.68
  5. Step 5: Solve for x
    x = 140,403.68/427.20
  6. Step 6: Final answer
    x = 328.66

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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.