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Finding the Fourth Proportional to 280.65, 421.02 and 248.46

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Solution

The fourth proportional to 280.65, 421.02 and 248.46 is: 372.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.65 : 421.02 = 248.46 : x
  2. Step 2: Convert to fraction form
    280.65/421.02 = 248.46/x
  3. Step 3: Cross multiply
    280.65x = 421.02 × 248.46
  4. Step 4: Simplify right side
    280.65x = 104,606.63
  5. Step 5: Solve for x
    x = 104,606.63/280.65
  6. Step 6: Final answer
    x = 372.73

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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.