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Finding the Fourth Proportional to 288.32, 433.68 and 261.60

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Solution

The fourth proportional to 288.32, 433.68 and 261.60 is: 393.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.32 : 433.68 = 261.60 : x
  2. Step 2: Convert to fraction form
    288.32/433.68 = 261.60/x
  3. Step 3: Cross multiply
    288.32x = 433.68 × 261.60
  4. Step 4: Simplify right side
    288.32x = 113,450.69
  5. Step 5: Solve for x
    x = 113,450.69/288.32
  6. Step 6: Final answer
    x = 393.49

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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.