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Finding the Fourth Proportional to 427.28, 589.65 and 240.78

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Solution

The fourth proportional to 427.28, 589.65 and 240.78 is: 332.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.28 : 589.65 = 240.78 : x
  2. Step 2: Convert to fraction form
    427.28/589.65 = 240.78/x
  3. Step 3: Cross multiply
    427.28x = 589.65 × 240.78
  4. Step 4: Simplify right side
    427.28x = 141,975.93
  5. Step 5: Solve for x
    x = 141,975.93/427.28
  6. Step 6: Final answer
    x = 332.28

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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.