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Finding the Fourth Proportional to 345.42, 477.09 and 280.26

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Solution

The fourth proportional to 345.42, 477.09 and 280.26 is: 387.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.42 : 477.09 = 280.26 : x
  2. Step 2: Convert to fraction form
    345.42/477.09 = 280.26/x
  3. Step 3: Cross multiply
    345.42x = 477.09 × 280.26
  4. Step 4: Simplify right side
    345.42x = 133,709.24
  5. Step 5: Solve for x
    x = 133,709.24/345.42
  6. Step 6: Final answer
    x = 387.09

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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.