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Finding the Fourth Proportional to 427.92, 590.64 and 280.80

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Solution

The fourth proportional to 427.92, 590.64 and 280.80 is: 387.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.92 : 590.64 = 280.80 : x
  2. Step 2: Convert to fraction form
    427.92/590.64 = 280.80/x
  3. Step 3: Cross multiply
    427.92x = 590.64 × 280.80
  4. Step 4: Simplify right side
    427.92x = 165,851.71
  5. Step 5: Solve for x
    x = 165,851.71/427.92
  6. Step 6: Final answer
    x = 387.58

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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.