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Finding the Fourth Proportional to 427.72, 590.40 and 280.48

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Solution

The fourth proportional to 427.72, 590.40 and 280.48 is: 387.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.72 : 590.40 = 280.48 : x
  2. Step 2: Convert to fraction form
    427.72/590.40 = 280.48/x
  3. Step 3: Cross multiply
    427.72x = 590.40 × 280.48
  4. Step 4: Simplify right side
    427.72x = 165,595.39
  5. Step 5: Solve for x
    x = 165,595.39/427.72
  6. Step 6: Final answer
    x = 387.16

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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.