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Finding the Fourth Proportional to 304.80, 457.36 and 280.88

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Solution

The fourth proportional to 304.80, 457.36 and 280.88 is: 421.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.80 : 457.36 = 280.88 : x
  2. Step 2: Convert to fraction form
    304.80/457.36 = 280.88/x
  3. Step 3: Cross multiply
    304.80x = 457.36 × 280.88
  4. Step 4: Simplify right side
    304.80x = 128,463.28
  5. Step 5: Solve for x
    x = 128,463.28/304.80
  6. Step 6: Final answer
    x = 421.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.