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Finding the Fourth Proportional to 288.55, 399.09 and 283.69

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Solution

The fourth proportional to 288.55, 399.09 and 283.69 is: 392.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.55 : 399.09 = 283.69 : x
  2. Step 2: Convert to fraction form
    288.55/399.09 = 283.69/x
  3. Step 3: Cross multiply
    288.55x = 399.09 × 283.69
  4. Step 4: Simplify right side
    288.55x = 113,217.84
  5. Step 5: Solve for x
    x = 113,217.84/288.55
  6. Step 6: Final answer
    x = 392.37

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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.