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Finding the Fourth Proportional to 353.30, 529.75 and 280.64

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Solution

The fourth proportional to 353.30, 529.75 and 280.64 is: 420.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.30 : 529.75 = 280.64 : x
  2. Step 2: Convert to fraction form
    353.30/529.75 = 280.64/x
  3. Step 3: Cross multiply
    353.30x = 529.75 × 280.64
  4. Step 4: Simplify right side
    353.30x = 148,667.34
  5. Step 5: Solve for x
    x = 148,667.34/353.30
  6. Step 6: Final answer
    x = 420.80

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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.