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Finding the Fourth Proportional to 354.07, 531.60 and 280.99

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Solution

The fourth proportional to 354.07, 531.60 and 280.99 is: 421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.07 : 531.60 = 280.99 : x
  2. Step 2: Convert to fraction form
    354.07/531.60 = 280.99/x
  3. Step 3: Cross multiply
    354.07x = 531.60 × 280.99
  4. Step 4: Simplify right side
    354.07x = 149,374.28
  5. Step 5: Solve for x
    x = 149,374.28/354.07
  6. Step 6: Final answer
    x = 421.88

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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.